Drop forged, hardened and tempered chrome vanadium steel with mirror finish. Includes sizes, metric: 6, 7, 8, 9, 10, 11, 12, 13, 14, 17, 19mm and AF sizes: 1/4", 5/16", 3/8", 7/16", 1/2", 9/16", 5/8", 11/16", 3/4", 13/16", 7/8". With storage rack