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: 7/16, 1/2, 9/16, 5/8, 11/16, 3/4, 13/16, 7/8, 15/16, 1, 1 1/16, & 1 1/8 in; Deep SAE socket sizes: 1/2, 9/16, 5/8, 11/16, 3/4, 13/16, 7/8, & 15/16 in; Standard metric socket sizes: 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, & 24 mm; Deep metric socket sizes: 10, 11, 12, 13, 14, 15, 16, 17, 18, & 19 mm; UNSPSC: 27111703