Features: Made from chrome vanadium, mirror polished for a fine finish, practical and long term use. 72 teeth ratchet ring, small head profile, high torque capacity. Professionally heat treated for strength and practability. Chrome vanadium steel forging, gears and jaw hardening heat treatment, hard wear-resistant. Through fine polished and plating bright chrome, rust and beautiful. 72 tooth drive technology, rotating 5 degrees can drive, facilitate to use in small space.