Chrome vanadium steel; Fully hardened and tempered; Raised panel chrome plated ; 12 SAE sizes: 1/4", 5/16", 3/8", 7/16", 1/2", 9/16", 5/8", 11/16", 3/4", 13/16", 7/8", 1" 12 Metric sizes: 7, 8, 9, 10, 11, 12, 13, 15, 17, 19, 21, 24 mm; With storage pouch