Grey Pneumatic (2192DT 1/2" Drive x 19mm and 21mm Socket 1/2" Drive x 19x21mm Deep Length Flip Impact. Made of high quality steel (chrome-molybdenum). Unique hex opening on each end so that a single socket can accommodate two hex sizes. Engineered specifically for use with impact tools, using the most up to date industrial specifications. The extra thin wall design allows easy access to recessed wheel nuts where space is limited. Due to the extra-thin wall design, this socket should only be used on wheel nuts where limited torque