DEI Stainless Steel Positive Locking Tie Eight 1/4in (7mm) x 9in and Four 7mm x 20inStainless Steel Positive Locking Ties secure exhaust wrap and solves the problem of needing a locking tie in high heat areas. Stainless Steel Positive Locking Ties are designed for high heat applications. With it's self locking design they are great for securing DEI exhaust wrap to pipes or any place a high strength tie is needed. UV and corrosion resistant they will last for many years under severe use. Locking Ties offer many other uses including