Lug Nut Impact Socket Set 1/2 inch Drive 6-Point 4-Piece:This 1/2 inch (12.7 mm) socket set includes 4 metric & SAE sizes—17mm / 3/4", 19mm / 13/16", 21mm / 15/16", 22mm / 7/8", along with a 3" (76.2 mm) extension bar. The two-in-one design makes it easier to change tires, brakes, and more. Made from heat-treated CR-MO steel, these sockets can withstand high torque from impact tools. High-contrast size markings allow for quick identification, even in low-light conditions. All sockets are stored in a convenient carrying case for easy organization and transport, ideal for vehicle maintenance.