The STEELMAN 99439 5-Piece 1/2-Inch Drive 6-Point Thin-Wall Impact Flip Socket Set was designed to save you time by maximizing efficiency. This set includes 4 dual-ended, 6-point impact grade flip sockets that each allow you to work two different sizes of lug nuts and fasteners without having to constantly switch sockets. Made of durable and hardened chromoly steel which is then given a black oxide protective coating, these sockets are designed to meet or exceed 150% proof of torque under ASME tool performance testing standards. Fitting easily over the included 3-inch 1/2-inch drive impact extension or onto an impact wrench's extended anvil, these socket's recessed edges provide the most accurate fit possible, gripping fasteners by the sides and not the edges which results in reduced slippage and rounding/fastener damage. In addition, the thin-walled design allows this socket to reach fasteners where there is less side clearance. Laser-etched size callouts make identification among other sockets easy. Set includes 17mm x 19mm and 19mm x 21mm metric sockets and 3/4-inch x 13/16-inch and 7/8-inch x 15/16-inch SAE / standard sockets. When not in use the set comes with a red powder coated steel wall mountable holder for easy, out of the way storage. Whether you’re a professional mechanic at a repair or tire shop, or just love to work on your own cars and vehicles, this flip impact socket set is a must for working efficiently!