Box End Strength, Open End Access. Set includes 1/4", 5/16", 11/32", 3/8", 7/16", 1/2", 9/16", 5/8", and 3/4" wrenches. 12pt Construction allows for more points of contact for versatility and more access. Box end design helps prevent wrench from damaging fasteners. All Craftsman combination wrenches are heat treated, oil quenched and tempered to harden and eliminate inner soft spots for uniformed hardness. Made in China.