The 135 pc. 1/4-in., 3/8-in., and 1/2-in. Drive Mechanics Tool Set is equipped with improved low profile 72-tooth ratchets with 5° arc swing and up to a 25% thinner head* that helps deliver greater access in confined spaces. Packed with a broad assortment of 6-point and 12-point sockets, combination wrenches, and drive tools in a durable blow mold case. The case is constructed with metal hinges and designed to fit into CRAFTSMAN metal storage boxes for easy organization. Perfect as an addition to your current tool collection or as a starter set. Proudly backed by a Full Lifetime Warranty. *1/4” DR and 3/8” DR Only As Compared To CMMT81747, CMMT81748, & CMMT81749