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 to 120 lb and multiple lengths ranging from 4 to 28 in 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.