3M Steel Barb Cable Ties are made of high-quality nylon 6/6 and designed with a stainless-steel barb that, when engaged, presses into the strap and grips tight. The strap features a robust, ribbed pattern to help ensure your bundles stay intact, even in high vibration environments. And unlike typical ratchet-style cable ties, the barb can be locked at any point along the strap, allowing for more precise positioning. Plus, the rectangular head design includes rounded corners and a curved tip for easy, fast installation with virtually no snagging – critical when working in extreme conditions.3M Steel Barb Cable Ties are available in several tensile strengths ranging from 18 lb. to 120 lb. and multiple lengths ranging from 4 inches to 28 inches to cover your needs. They are offered in natural for indoor use and UV weather-resistant black for indoor and outdoor use. UL Listed 62275 Type 21 or 21S and Plenum Rated AH-2 for use in air handling spaces.