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