Products Description Four (4) socket sizes: 11/16" (17mm), 3/4" (19mm), 13/16" (21mm), and 7/8" (22mm). X-shaped design allows for two-handed use and increased torque,which used to loosen and tighten lug nuts on automobile wheels. 6-point openings snugly fit hex-shaped lug nuts and help prevent slipping, especially when nuts are worn or rusted. Openings are designed to grip the flat sides of nuts, not the corners, to prevent round-off. Each socket size is directly stamped into the wrench for clear and permanent identification.