Stanley TRA705-5C 5,000 Units 5/16-Inch Heavy Duty Staples For heavy duty stapling jobs such as insulation, carpet under laying and roofing felt Stanley - Black & Decker Sturdy plastic packaging reduces staple breakage Heavy Duty Narrow Crown fits TR100, TR200, TRE500 series, PHT150, PHT250 and Arrow T-50 Limited Lifetime Warranty For heavy duty stapling jobs such as insulation, carpet under laying and roofing felt Color-coded packaging makes size and product selection a cinch Sturdy plastic packaging reduces staple breakage Heavy Duty  Narrow Crown  fits TR100, TR200, TRE500 series, PHT150, PHT250 and Arrow T-50 Limited Lifetime Warranty