Talk about versatile! This stylish 1/2 in drive impact flip socket fits 19 mm and 21 mm lug nuts. Built of strong premium chromoly steel with a beautiful stealth black phosphate finish, theses sockets have thick walls that pass torque wind-up from the impact tool to the fastener with maximum power and minimum drama. The high contrast size markings won't wear off so finding the right socket end is easy. Inside, our innovative Z-Drive design helps sockets get a better grip by turning fasteners by their sides, not their corners, giving you more control and reducing slippage at hig-torque loads. Precision chamfered openings make it easier to slide the sockets over fasteners. Dependable Powerbuilt sockets meet or exceed ANSI standards and have a lifetime warranty, all at affordable prices.