The PowerGRP GRP-7500X 1000-Count Bulk Resealable Pack of Type 21S AH-2 Black-Colored General-Purpose Cable Ties are 7" long, with 50lb of tensile strength for professional applications. They're made from polyamide 6,6 nylon, resulting in a high mechanical strength and a wide temperature range (-40 F to 185 F). Fasten these 7" cables ties around a wide range of equipment with a bundle diameter between .12" (3mm) and 1.81" (46mm), using the bent tips and serrated locking mechanism to form an effortless And Secure Grip. Designed For Cable Management In Industrial Applications And Use In Plenum Spaces.