... . 2. Plated with nickel and chrome 3. Meet and exceed ANSI standard 1. made of heat-treated Chrome Vanadium steeel for strength ... chrome3. superior life-time test4. meet and exceed ANSI standard11 pcs Wrench HolderSize:MM= 6MM, 8MM, 9MM, 10MM, 11MM, 13MM, 14MM ... /16", 3/8", 7/16", 1/2", 9/16", 5/8", 11/16", 3/4", 13/16", 7/8" 11 pcs combination Wrench Set