Tensioner manufacturers are manufacturing sites or procedures, so there is no fixed staff management as well as existing memory. Tensioner direct sales? Tensioner is used after the use of the use of the use of it will be thrown out, substantially increase the chance of seat belt breakage. The production of steel wire is not standardized,Now, the hooks used by the enterprise are divided into two parts:factory production and enterprise homemade. The quality of the product of the manufacturing factory is the important reason of the accident. Several steel wire manufacturers do not manufacture and inspect their products according to national standards. For example, in 1999, a factory purchased 8 round welded chains with a capacity of 10 tons, and 1 of them suddenly broke in use. After inspection, the welded seam of the chain was obviously welded and belonged to "three no" products, no certificate, no inspection mark and quality grade mark. Some companies buy ropes from outside and use the existing equipment and personnel of the company to the limit.