Williams TS51827 1/2 Drive Turbo Socket, 21mm Quickly and easily remove damaged or rounded nuts and bolts Place socket on fastener and turn with ratchet, breaker bar or T-handle Grip on fastener tightens as more torque is applied No hammering is required to install socket over fastener Use on all types of standard nuts and bolts as well as studs, pipe nipples, and corroded auto and marine fasteners