The 104 pc. Mechanic Tool Set is a comprehensive 1/4 in. and 3/8 in. drive mechanic tool set that is packed into Craftsman's Portable Tool Box with 20.5 in. ball-bearing drawers. An ideal set to incorporate into an existing arsenal of tools or a great starter set. This set features Craftsman's 72 Tooth 1/4 in. and 3/8 in. Drive Quick Release Ratchets (CMMT81747 & CMMT81748) which provide users with an ideal balance between durability and accessibility.