1. Wrench made of C.V. 2. Plated with nickel and chrome 3. Meet and ... chrome3. superior life-time test4. meet and exceed ANSI standard 11 pcs Wrench Holder Size:MM= 6MM, 8MM, 9MM, 10MM, 11MM ... ", 3/8", 7/16", 1/2", 9/16", 5/8", 11/16", 3/4", 13/16", 7/8"