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  <xsd:element id="iiin_AmortizationOfFinancingCostsYear3" name="AmortizationOfFinancingCostsYear3" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant"/>
  <xsd:element id="iiin_AmortizationOfFinancingCostsYear4" name="AmortizationOfFinancingCostsYear4" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant"/>
  <xsd:element id="iiin_AmortizationOfFinancingCostsYear5" name="AmortizationOfFinancingCostsYear5" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant"/>
  <xsd:element abstract="true" id="iiin_AssetImpairmentsMember" name="AssetImpairmentsMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" xbrli:periodType="duration"/>
  <xsd:element id="iiin_BusinessAcquisitionProFormaIncomeLossBeforeIncomeTaxes" name="BusinessAcquisitionProFormaIncomeLossBeforeIncomeTaxes" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration"/>
  <xsd:element id="iiin_BusinessCombinationHoldbackAdjustment" name="BusinessCombinationHoldbackAdjustment" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration"/>
  <xsd:element id="iiin_BusinessCombinationHoldbackLiabilityCurrent" name="BusinessCombinationHoldbackLiabilityCurrent" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant"/>
  <xsd:element id="iiin_BusinessCombinationRecognizedIdentifiableAssetAcquiredAndLiabilityAssumedCurrentLiabilitiesLeaseObligation" name="BusinessCombinationRecognizedIdentifiableAssetAcquiredAndLiabilityAssumedCurrentLiabilitiesLeaseObligation" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant"/>
  <xsd:element id="iiin_BusinessCombinationRecognizedIdentifiableAssetAcquiredAndLiabilityAssumedNoncurrentLiabilitiesLeaseObligation" name="BusinessCombinationRecognizedIdentifiableAssetAcquiredAndLiabilityAssumedNoncurrentLiabilitiesLeaseObligation" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant"/>
  <xsd:element id="iiin_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccruedLiabilities" name="BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccruedLiabilities" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant"/>
  <xsd:element id="iiin_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedRightofuseAssets" name="BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedRightofuseAssets" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant"/>
  <xsd:element id="iiin_ControlAgreementAutomaticallyRenewalTerm" name="ControlAgreementAutomaticallyRenewalTerm" nillable="true" substitutionGroup="xbrli:item" type="xbrli:durationItemType" xbrli:periodType="duration"/>
  <xsd:element id="iiin_ControlAgreementInitialTerm" name="ControlAgreementInitialTerm" nillable="true" substitutionGroup="xbrli:item" type="xbrli:durationItemType" xbrli:periodType="duration"/>
  <xsd:element id="iiin_CreditFacilityLiquidityAmount" name="CreditFacilityLiquidityAmount" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:periodType="duration"/>
  <xsd:element id="iiin_DebtInstrumentDefaultInterestRateIncrease" name="DebtInstrumentDefaultInterestRateIncrease" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:percentItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="iiin_DecreaseInAssumedDiscountRateMember" name="DecreaseInAssumedDiscountRateMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" xbrli:periodType="duration"/>
  <xsd:element id="iiin_DefinedBenefitPlanDecreaseInNetPeriodicPensionCost" name="DefinedBenefitPlanDecreaseInNetPeriodicPensionCost" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration"/>
  <xsd:element id="iiin_DefinedBenefitPlanEmploymentTerm" name="DefinedBenefitPlanEmploymentTerm" nillable="true" substitutionGroup="xbrli:item" type="xbrli:durationItemType" xbrli:periodType="duration"/>
  <xsd:element id="iiin_DefinedBenefitPlanExpectedFutureBenefitPayment" name="DefinedBenefitPlanExpectedFutureBenefitPayment" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:periodType="instant"/>
  <xsd:element id="iiin_DefinedBenefitPlanIncreaseInAccumulatedBenefitObligation" name="DefinedBenefitPlanIncreaseInAccumulatedBenefitObligation" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration"/>
  <xsd:element id="iiin_DefinedBenefitPlanIncreaseOfPensionPlanWithProjectedBenefitObligationInExcessOfPlanAssetsPlanAssets" name="DefinedBenefitPlanIncreaseOfPensionPlanWithProjectedBenefitObligationInExcessOfPlanAssetsPlanAssets" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration"/>
  <xsd:element id="iiin_DefinedBenefitPlanNumberOfYearsInAverageAnnualBaseSalary" name="DefinedBenefitPlanNumberOfYearsInAverageAnnualBaseSalary" nillable="true" substitutionGroup="xbrli:item" type="xbrli:durationItemType" xbrli:periodType="duration"/>
  <xsd:element id="iiin_DefinedBenefitPlanNumberOfYearsPrecedingRetirementForAverageAnnualBaseSalaryCalculation" name="DefinedBenefitPlanNumberOfYearsPrecedingRetirementForAverageAnnualBaseSalaryCalculation" nillable="true" substitutionGroup="xbrli:item" type="xbrli:durationItemType" xbrli:periodType="duration"/>
  <xsd:element id="iiin_DefinedBenefitPlanPercentOfHighestAverageSalaryBase" name="DefinedBenefitPlanPercentOfHighestAverageSalaryBase" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:percentItemType" xbrli:periodType="duration"/>
  <xsd:element id="iiin_DefinedBenefitPlanReductionForEachMonth" name="DefinedBenefitPlanReductionForEachMonth" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:percentItemType" xbrli:periodType="instant"/>
  <xsd:element id="iiin_DefinedBenefitPlanRetirementAge" name="DefinedBenefitPlanRetirementAge" nillable="true" substitutionGroup="xbrli:item" type="xbrli:integerItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="iiin_DocumentAndEntityInformation" name="DocumentAndEntityInformation" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element id="iiin_EffectiveIncomeTaxRateReconciliationOfficersLifeInsuranceAmount" name="EffectiveIncomeTaxRateReconciliationOfficersLifeInsuranceAmount" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration"/>
  <xsd:element id="iiin_EffectiveIncomeTaxRateReconciliationOfficersLifeInsurancePercent" name="EffectiveIncomeTaxRateReconciliationOfficersLifeInsurancePercent" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:percentItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="iiin_EngineeredWireProductsIncMember" name="EngineeredWireProductsIncMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="iiin_EquipmentRelocationMember" name="EquipmentRelocationMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="iiin_FederalFundsRateMember" name="FederalFundsRateMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" xbrli:periodType="duration"/>
  <xsd:element id="iiin_FixedChargeCoverageRatio" name="FixedChargeCoverageRatio" nillable="true" substitutionGroup="xbrli:item" type="xbrli:pureItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="iiin_FloridaDepartmentOfRevenueMember" name="FloridaDepartmentOfRevenueMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" xbrli:periodType="duration"/>
  <xsd:element id="iiin_HealthcareCoverageClaimsInExcessOf" name="HealthcareCoverageClaimsInExcessOf" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration"/>
  <xsd:element id="iiin_IncreaseInCashSurrenderValueOfLifeInsurancePolicies" name="IncreaseInCashSurrenderValueOfLifeInsurancePolicies" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration"/>
  <xsd:element id="iiin_IncreaseInCashSurrenderValueOfLifeInsurancePoliciesOverPremiumsPaid" name="IncreaseInCashSurrenderValueOfLifeInsurancePoliciesOverPremiumsPaid" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration"/>
  <xsd:element id="iiin_KeyMembersOfManagementMember" name="KeyMembersOfManagementMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" xbrli:periodType="duration"/>
  <xsd:element id="iiin_LesseeOperatingLeaseAssetsAndLiabilitiesTableTextBlock" name="LesseeOperatingLeaseAssetsAndLiabilitiesTableTextBlock" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType" xbrli:periodType="duration"/>
  <xsd:element id="iiin_LineOfCreditFacilityAdditionalBorrowingCapacity" name="LineOfCreditFacilityAdditionalBorrowingCapacity" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration"/>
  <xsd:element id="iiin_NoCustomersMember" name="NoCustomersMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="iiin_NonCancelablePurchaseCommitmentForRawMaterialMember" name="NonCancelablePurchaseCommitmentForRawMaterialMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" xbrli:periodType="duration"/>
  <xsd:element id="iiin_NonCancelablePurchaseCommitmentTerm" name="NonCancelablePurchaseCommitmentTerm" nillable="true" substitutionGroup="xbrli:item" type="xbrli:durationItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="iiin_NonFinancialMember" name="NonFinancialMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="iiin_NoteToFinancialStatementDetailsTextual" name="NoteToFinancialStatementDetailsTextual" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="iiin_NotesToFinancialStatements" name="NotesToFinancialStatements" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="iiin_NotesToFinancialStatementsAbstract" name="NotesToFinancialStatementsAbstract" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="iiin_OBrienWireProductsOfTexasMember" name="OBrienWireProductsOfTexasMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" xbrli:periodType="duration"/>
  <xsd:element id="iiin_OperatingLeaseTermRequiredToBeRecordedOnTheBalanceSheetThreshold" name="OperatingLeaseTermRequiredToBeRecordedOnTheBalanceSheetThreshold" nillable="true" substitutionGroup="xbrli:item" type="xbrli:durationItemType" xbrli:periodType="duration"/>
  <xsd:element id="iiin_OtherFinancialDataTextBlock" name="OtherFinancialDataTextBlock" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType" xbrli:periodType="duration"/>
  <xsd:element id="iiin_OtherFinancialInformationBalanceSheetTableTextBlock" name="OtherFinancialInformationBalanceSheetTableTextBlock" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="iiin_PCStrandMember" name="PCStrandMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="iiin_PolicyTable" name="PolicyTable" nillable="true" substitutionGroup="xbrldt:hypercubeItem" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element id="iiin_ProceedsFromAssetsHeldForSale" name="ProceedsFromAssetsHeldForSale" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration"/>
  <xsd:element id="iiin_ProceedsFromSurrenderOfLifeInsurancePolicies" name="ProceedsFromSurrenderOfLifeInsurancePolicies" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="iiin_PurchaseCommitmentForEquipmentMember" name="PurchaseCommitmentForEquipmentMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="iiin_ReducedSERPMember" name="ReducedSERPMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" xbrli:periodType="duration"/>
  <xsd:element id="iiin_RestrictedStockUnitsAndStockOptionsSurrenderedForWithholdingTaxesPayable" name="RestrictedStockUnitsAndStockOptionsSurrenderedForWithholdingTaxesPayable" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="iiin_RetirementSavingsPlanFirst1PercentOfEmployeeContributionMember" name="RetirementSavingsPlanFirst1PercentOfEmployeeContributionMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="iiin_RetirementSavingsPlanMember" name="RetirementSavingsPlanMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="iiin_RetirementSavingsPlanNext5PercentOfEmployeeContributionMember" name="RetirementSavingsPlanNext5PercentOfEmployeeContributionMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="iiin_SOFRBasedLoansMember" name="SOFRBasedLoansMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" xbrli:periodType="duration"/>
  <xsd:element id="iiin_ScheduleOfAmortizationOfFinancingCostsForDebtTableTextBlock" name="ScheduleOfAmortizationOfFinancingCostsForDebtTableTextBlock" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="iiin_SecuredOvernightFinancingRateSOFRCreditAdjustmentMember" name="SecuredOvernightFinancingRateSOFRCreditAdjustmentMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" xbrli:periodType="duration"/>
  <xsd:element id="iiin_SelfinsuredHealthInsurancePlanContributionCost" name="SelfinsuredHealthInsurancePlanContributionCost" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration"/>
  <xsd:element id="iiin_SeveranceAgreementInitialTerm" name="SeveranceAgreementInitialTerm" nillable="true" substitutionGroup="xbrli:item" type="xbrli:durationItemType" xbrli:periodType="duration"/>
  <xsd:element id="iiin_SeveranceAgreementRenewalTerm" name="SeveranceAgreementRenewalTerm" nillable="true" substitutionGroup="xbrli:item" type="xbrli:durationItemType" xbrli:periodType="duration"/>
  <xsd:element id="iiin_SeveranceBenefitRatioOfAverageBonusReceivedIfCEOTerminationWithinTwoYears" name="SeveranceBenefitRatioOfAverageBonusReceivedIfCEOTerminationWithinTwoYears" nillable="true" substitutionGroup="xbrli:item" type="xbrli:integerItemType" xbrli:periodType="instant"/>
  <xsd:element id="iiin_SeveranceBenefitRatioOfAverageBonusReceivedIfOtherKeyMembersOfManagementTerminationWithinTwoYears" name="SeveranceBenefitRatioOfAverageBonusReceivedIfOtherKeyMembersOfManagementTerminationWithinTwoYears" nillable="true" substitutionGroup="xbrli:item" type="xbrli:integerItemType" xbrli:periodType="instant"/>
  <xsd:element id="iiin_SeveranceBenefitRatioOfBaseCompensationReceivedIfOtherKeyMembersOfManagementTerminationWithinTwoYears" name="SeveranceBenefitRatioOfBaseCompensationReceivedIfOtherKeyMembersOfManagementTerminationWithinTwoYears" nillable="true" substitutionGroup="xbrli:item" type="xbrli:integerItemType" xbrli:periodType="instant"/>
  <xsd:element id="iiin_SeveranceBenefitRatioOfBaseCompensationReceivedIfTerminationWithinTwoYears" name="SeveranceBenefitRatioOfBaseCompensationReceivedIfTerminationWithinTwoYears" nillable="true" substitutionGroup="xbrli:item" type="xbrli:pureItemType" xbrli:periodType="instant"/>
  <xsd:element id="iiin_SeveranceBenefitReceivedTermForThePriorYearsIfCEOTerminationWithinTwoYears" name="SeveranceBenefitReceivedTermForThePriorYearsIfCEOTerminationWithinTwoYears" nillable="true" substitutionGroup="xbrli:item" type="xbrli:durationItemType" xbrli:periodType="duration"/>
  <xsd:element id="iiin_SeveranceBenefitReceivedTermForThePriorYearsIfOtherMembersOfManagementTerminationWithinTwoYears" name="SeveranceBenefitReceivedTermForThePriorYearsIfOtherMembersOfManagementTerminationWithinTwoYears" nillable="true" substitutionGroup="xbrli:item" type="xbrli:durationItemType" xbrli:periodType="duration"/>
  <xsd:element id="iiin_SeveranceBenefitsContinuationOfHealthAndWelfareBenefitsTermIfCEOTerminationWithinTwoYears" name="SeveranceBenefitsContinuationOfHealthAndWelfareBenefitsTermIfCEOTerminationWithinTwoYears" nillable="true" substitutionGroup="xbrli:item" type="xbrli:durationItemType" xbrli:periodType="duration"/>
  <xsd:element id="iiin_SeveranceBenefitsContinuationOfHealthAndWelfareBenefitsTermIfOtherMembersOfManagementTerminationWithinTwoYears" name="SeveranceBenefitsContinuationOfHealthAndWelfareBenefitsTermIfOtherMembersOfManagementTerminationWithinTwoYears" nillable="true" substitutionGroup="xbrli:item" type="xbrli:durationItemType" xbrli:periodType="duration"/>
  <xsd:element id="iiin_SummaryOfIncomeTaxPaidTableTextBlock" name="SummaryOfIncomeTaxPaidTableTextBlock" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType" xbrli:periodType="duration"/>
  <xsd:element id="iiin_SupplementalRetirementBenefitPeriod" name="SupplementalRetirementBenefitPeriod" nillable="true" substitutionGroup="xbrli:item" type="xbrli:durationItemType" xbrli:periodType="duration"/>
  <xsd:element id="iiin_TerminationBenefitContinuationTermForHealthAndWelfareBenefit" name="TerminationBenefitContinuationTermForHealthAndWelfareBenefit" nillable="true" substitutionGroup="xbrli:item" type="xbrli:durationItemType" xbrli:periodType="duration"/>
  <xsd:element id="iiin_TerminationBenefitRatioOfAnnualBaseSalaryReceivedOnTerminationDate" name="TerminationBenefitRatioOfAnnualBaseSalaryReceivedOnTerminationDate" nillable="true" substitutionGroup="xbrli:item" type="xbrli:pureItemType" xbrli:periodType="instant"/>
  <xsd:element abstract="true" id="iiin_The2025EquityIncentivePlanMember" name="The2025EquityIncentivePlanMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="iiin_UpperSanduskyClosureMember" name="UpperSanduskyClosureMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="iiin_VEBAMember" name="VEBAMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="iiin_WeldedWireReinforcementMember" name="WeldedWireReinforcementMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="iiin_statement-statement-insider-trading-policy-" name="statement-statement-insider-trading-policy-" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="iiin_statement-statement-note-10-income-taxes-components-of-provision-for-income-taxes-details" name="statement-statement-note-10-income-taxes-components-of-provision-for-income-taxes-details" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="iiin_statement-statement-note-10-income-taxes-deferred-tax-asset-and-liability-components-details" name="statement-statement-note-10-income-taxes-deferred-tax-asset-and-liability-components-details" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="iiin_statement-statement-note-10-income-taxes-income-tax-reconciliation-details" name="statement-statement-note-10-income-taxes-income-tax-reconciliation-details" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="iiin_statement-statement-note-10-income-taxes-summary-of-income-taxes-paid-details" name="statement-statement-note-10-income-taxes-summary-of-income-taxes-paid-details" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="iiin_statement-statement-note-10-income-taxes-tables" name="statement-statement-note-10-income-taxes-tables" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="iiin_statement-statement-note-11-employee-benefit-plans-net-periodic-pension-costs-and-related-components-details" name="statement-statement-note-11-employee-benefit-plans-net-periodic-pension-costs-and-related-components-details" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="iiin_statement-statement-note-11-employee-benefit-plans-plan-valuation-assumptions-details" name="statement-statement-note-11-employee-benefit-plans-plan-valuation-assumptions-details" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="iiin_statement-statement-note-11-employee-benefit-plans-projected-benefit-obligation-reconciliation-for-serp-details" name="statement-statement-note-11-employee-benefit-plans-projected-benefit-obligation-reconciliation-for-serp-details" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="iiin_statement-statement-note-11-employee-benefit-plans-projected-benefit-payments-details" name="statement-statement-note-11-employee-benefit-plans-projected-benefit-payments-details" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="iiin_statement-statement-note-11-employee-benefit-plans-tables" name="statement-statement-note-11-employee-benefit-plans-tables" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="iiin_statement-statement-note-13-leases-aggregate-future-operating-lease-payments-details" name="statement-statement-note-13-leases-aggregate-future-operating-lease-payments-details" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="iiin_statement-statement-note-13-leases-supplement-cash-flow-and-noncash-information-weighted-average-remaining-lease-term-and-discount-rate-related-to-lease-details" name="statement-statement-note-13-leases-supplement-cash-flow-and-noncash-information-weighted-average-remaining-lease-term-and-discount-rate-related-to-lease-details" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="iiin_statement-statement-note-13-leases-supplement-cash-flow-and-noncash-information-weighted-average-remaining-lease-term-and-discount-rate-related-to-lease-detailsDCE37F02-3FC2-44E3-B3F1-0DCE23CA76F3" name="statement-statement-note-13-leases-supplement-cash-flow-and-noncash-information-weighted-average-remaining-lease-term-and-discount-rate-related-to-lease-detailsDCE37F02-3FC2-44E3-B3F1-0DCE23CA76F3" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="iiin_statement-statement-note-13-leases-supplemental-balance-sheet-information-related-to-leases-details" name="statement-statement-note-13-leases-supplemental-balance-sheet-information-related-to-leases-details" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="iiin_statement-statement-note-13-leases-tables" name="statement-statement-note-13-leases-tables" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="iiin_statement-statement-note-14-earnings-per-share-basic-and-diluted-earnings-per-share-attributable-to-common-shareholders-details" name="statement-statement-note-14-earnings-per-share-basic-and-diluted-earnings-per-share-attributable-to-common-shareholders-details" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="iiin_statement-statement-note-14-earnings-per-share-tables" name="statement-statement-note-14-earnings-per-share-tables" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="iiin_statement-statement-note-15-business-segment-information-net-sales-by-geographic-region-details" name="statement-statement-note-15-business-segment-information-net-sales-by-geographic-region-details" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="iiin_statement-statement-note-15-business-segment-information-net-sales-by-product-line-details" name="statement-statement-note-15-business-segment-information-net-sales-by-product-line-details" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="iiin_statement-statement-note-15-business-segment-information-tables" name="statement-statement-note-15-business-segment-information-tables" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="iiin_statement-statement-note-16-other-financial-data-balance-sheet-information-details" name="statement-statement-note-16-other-financial-data-balance-sheet-information-details" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="iiin_statement-statement-note-16-other-financial-data-tables" name="statement-statement-note-16-other-financial-data-tables" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="iiin_statement-statement-note-5-restructuring-and-business-combinations-assets-acquired-and-liabilities-assumed-details" name="statement-statement-note-5-restructuring-and-business-combinations-assets-acquired-and-liabilities-assumed-details" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="iiin_statement-statement-note-5-restructuring-and-business-combinations-assets-acquired-and-liabilities-assumed-detailsBF7186D6-A6F5-4B83-A1E8-0E1E31EF65EB" name="statement-statement-note-5-restructuring-and-business-combinations-assets-acquired-and-liabilities-assumed-detailsBF7186D6-A6F5-4B83-A1E8-0E1E31EF65EB" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="iiin_statement-statement-note-5-restructuring-and-business-combinations-pro-forma-information-details" name="statement-statement-note-5-restructuring-and-business-combinations-pro-forma-information-details" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="iiin_statement-statement-note-5-restructuring-and-business-combinations-restructuring-activity-related-to-business-combinations-details" name="statement-statement-note-5-restructuring-and-business-combinations-restructuring-activity-related-to-business-combinations-details" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="iiin_statement-statement-note-5-restructuring-and-business-combinations-restructuring-activity-related-to-business-combinations-details2C0F1FB0-19A5-4590-90C5-05DE5107FB8F" name="statement-statement-note-5-restructuring-and-business-combinations-restructuring-activity-related-to-business-combinations-details2C0F1FB0-19A5-4590-90C5-05DE5107FB8F" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="iiin_statement-statement-note-5-restructuring-and-business-combinations-restructuring-activity-related-to-business-combinations-details61C5B427-A03C-40EE-AE0D-44570A4000E9" name="statement-statement-note-5-restructuring-and-business-combinations-restructuring-activity-related-to-business-combinations-details61C5B427-A03C-40EE-AE0D-44570A4000E9" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="iiin_statement-statement-note-5-restructuring-and-business-combinations-tables" name="statement-statement-note-5-restructuring-and-business-combinations-tables" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="iiin_statement-statement-note-6-fair-value-measurements-fair-value-of-financial-assets-details" name="statement-statement-note-6-fair-value-measurements-fair-value-of-financial-assets-details" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="iiin_statement-statement-note-6-fair-value-measurements-tables" name="statement-statement-note-6-fair-value-measurements-tables" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="iiin_statement-statement-note-7-intangible-assets-summary-of-intangible-assets-details" name="statement-statement-note-7-intangible-assets-summary-of-intangible-assets-details" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="iiin_statement-statement-note-7-intangible-assets-tables" name="statement-statement-note-7-intangible-assets-tables" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="iiin_statement-statement-note-8-longterm-debt-schedule-of-amortization-of-financing-costs-details" name="statement-statement-note-8-longterm-debt-schedule-of-amortization-of-financing-costs-details" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="iiin_statement-statement-note-8-longterm-debt-tables" name="statement-statement-note-8-longterm-debt-tables" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="iiin_statement-statement-note-9-stockbased-compensation-restricted-stock-units-activity-details" name="statement-statement-note-9-stockbased-compensation-restricted-stock-units-activity-details" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="iiin_statement-statement-note-9-stockbased-compensation-rsu-grants-and-compensation-expense-details" name="statement-statement-note-9-stockbased-compensation-rsu-grants-and-compensation-expense-details" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="iiin_statement-statement-note-9-stockbased-compensation-stock-option-activity-details" name="statement-statement-note-9-stockbased-compensation-stock-option-activity-details" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="iiin_statement-statement-note-9-stockbased-compensation-stock-option-valuation-assumptions-details" name="statement-statement-note-9-stockbased-compensation-stock-option-valuation-assumptions-details" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="iiin_statement-statement-note-9-stockbased-compensation-tables" name="statement-statement-note-9-stockbased-compensation-tables" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="iiin_statement-statement-significant-accounting-policies-policies" name="statement-statement-significant-accounting-policies-policies" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
</xsd:schema>
