Craftsman Quality - Wrenches are Made in the United States of America. Box End Strength, Open End Access. Set includes 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, and 18 mm 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.