1. Wrench made of C.V. 2. Plated with nickel and chrome ... . superior life-time test4. meet and exceed ANSI standard8 pcs Wrench HolderSize:MM= 8MM, 10MM, 11MM, 12MM, 13MM, 14MM, 17MM, 19MMSAE ... = 5/16", 3/8", 7/16", 1/2", 9/16", 5/8", 11/16", 3/4" 8pcs spanner set ...