Goplus 21pcs SAE 3/4" Drive Socket Set w/Case Jumbo Ratchet Wrench Extension (21pcs) Durable Steel: This drive socket set is made of solid carbon steel, and chromate finish makes it more strength and durability. High-performance chrome vanadium steel sockets can be used with impact wrenches. High-torque Design: 6-point sockets grip flat sides of fasteners, not corners, preventing round-off. Easy to change direction with a flick of a switch, selecting direction is easy, smooth and positive. Clear Size Mark: There are high-visibility etched size on every sockets for easy distinguishing and selecting. Besides, sizes are also marked front of every slot on the case for organized store. Easy to Store and Carry: Comes with a black blow molded box, which not only makes every part organized well, but also makes it convenient for you to bring and storage. Wide Application: This drive socket set features 16 sockets that range from 7/8" to 2". Also includes the heavy duty "click type" ratchet (20" long), a flexible bar (18" long) and two extension bars (4" and 8"), which will meet your different needs in work.