Campbell Hausfeld 1" Twin Hammer Pistol Grip Impact Wrench Air Tool SA2559 Used for truck pad removal, spring work, pinion nut, leg nuts and engine teardowns Specification: Square Drive: 1" Free Speed: 5000 RPM Max Torque: 1000FT-LB Air Inlet: 3/8 NPT (Female) Length: 194mm Weight: 5.5 Kg.