The 4-pc Metric Lug Socket Set with Carbon Fiber Sleeves, No. 4250, from CTA Tools includes a removable, extra-thin carbon fiber protective sleeves to safeguard wheel finishes from damage. The fiber sleeves enhance socket durability, allowing for a thicker overall socket design that resists cracking at hex points under extreme impact torque. Designed with a finger-width divot, these sockets offer easier installation and removal compared to standard impact lug nut sockets. For use with 1/2" square drive tools. This set includes sizes 17mm (blue), 19mm (yellow), 21mm (red), and 22mm (green). Packaged in a compact blow-mold case for organized storage in any toolbox.