These Draper Hi-TORQ 6-point deep impact sockets are forged from hardened chrome molybdenum steel. Black phosphate finish for corrosion protection. For use with electric or pneumatic impact wrenches with a 3/4"" drive. Supplied with ring and pin. Always use a ring and pin to secure 3/4"" square drive impact sockets to the output shaft of the impact wrench. All Draper 3/4"" square drive impact socketry is supplied with a ring and pin as standard.