Lug Nut Impact Socket Set 1/2 inch Drive 6-Point 8-Piece:This 1/2 inch (12.7 mm) socket set includes 4 SAE sizes 3/4in, 13/16in, 7/8in, 15/16in and 4 metric sizes 17mm, 19mm, 21mm, 22 mm, along with a 3" (76.2 mm) extension bar. 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.