1. Wrench made of C.V. 2. Plated with nickel and chrome ... . superior life-time test4. meet and exceed ANSI standard12 pcs Wrench PouchSize:MM= 6MM, 8MM, 10MM, 11MM, 12MM, 13MM, 14MM, 16MM ... = 1/4", 5/16", 3/8", 7/16", 1/2", 9/16", 5/8", 11/16", 3/4", 13/16", 7/8", 15/16" 12pcs Wrench Set