Designed with efficiency in the face of even the busiest shops the STEELMAN 60443 5-Piece 1/2-Inch Drive 6-Point Impact Flip Socket and Knockout Bar Set helps save time by doubling the number of fasteners each socket can fit. Included in the set are 4 dual ended, 6-point impact grade flip sockets fitting 18.5mm, 19.5mm, 21mm, 21.5mm, 22mm, and 22.5mm lug nuts with some overlap between sockets to allow maximum usability between multiple technicians. 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 an 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. Laser-etched size callouts make identification among other sockets easy. To help deal with lug nuts that get too at home inside the sockets the set includes a 4-inch chrome-vanadium steel knockout bar that can be used to push the stuck lug out of the socket. When not in use the set comes with a blow-molded plastic case 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!