The PowerGRP GRP-18500 100-Count Resealable Pack of Type 21S AH-2 Black-Colored General-Purpose Cable Ties are 18 long, with 50lb of tensile strength for professional applications. Theyre made from polyamide 6,6 nylon, resulting in a high mechanical strength and a wide temperature range (-40 F to 185 F). Fasten these 18 cables ties around a wide range of equipment with a bundle diameter between .12 (3mm) and 4.57 (116mm), 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.