The CP6500 1/2" impact wrench with ring socket retainer is a safe bet. With its powerful oil bath twin hammer clutch mechanism, aluminum body, and steel clutch housing, it is a perfect bolting tool for tough environments. It delivers max reverse torque up to 850 Nm /625 ft.lb. The oil bath clutch mechanism guarantees a low level of friction, which increases clutch component lifespan. Recommended only for industrial sites where positive socket retention is not mandated.  Features friction ring socket retainer.