This all-in-one 308 pc. Mechanics Tool Set comes equipped with 1/4-in., 3/8-in., and 1/2-in. drive improved low profile 72-Tooth ratchets with a 5° arc swing and up to a 25% thinner head* that helps deliver greater access in confined spaces. Packed with a comprehensive assortment of 6-point and 12-point sockets, combination wrenches, and drive tool accessories, this set is perfect for automotive and DIY repairs or as a complete starter set. Tools come assembled in plastic trays for easy organization. Proudly backed by a Full Lifetime Warranty. *1/4 DR and 3/8 DR Only As Compared To CMMT81747, CMMT81748, & CMMT81749