Constructed of chrome vanadium alloy steel for strength and long life and includes a convenient blow molded case for easy storage. Triple chrome plating and ultra smooth high polish finish for added life; Meets and exceeds US federal standards for strength and performance; Standard SAE socket sizes: 1/4, 5/16, 3/8, 7/16, 1/2, 9/16, 5/5, 11/16, 3/4, 13/16, 7/8, 15/16, & 1 in; Deep SAE socket sizes: 1/4, 5/16, 3/8, 7/16, 1/2, 9/16, 5/5, 11/16, 3/4, 13/16, & 7/8 in; Standard metric socket sizes: 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, & 19 mm; Deep metric socket sizes: 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, & 19 mm; UNSPSC: 27111703