-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 This 1000-pack of 9/16 heavy-duty narrow crown staples are convenient and reliable. Used for heavy-duty stapling jobs such as insulation carpet underlayment and roofing felt these staples come in sturdy plastic packaging to helps reduce breakage of the stick. With color-coded packaging you can easily choose the correct brads for the project you are working on.