Description Free Speed: 7.500 RPM Maximum Torque: 420 ft.-lbs. Working Torque: 370 to 390 ft.-lbs. Recommended Air Pressure: 90psi Average Air Consumption: 5 SCFM Air Inlet Size: 1/4 NPT Recommended Air Hose Size: 3/8" ID Tool Length: 7.3" Tool Weight: 5.7lbs. Twin-Hammer impact mechanism provides up to 420 ft.-lbs. of torque Pressure feed lubrication Steel nose case with lightweight aluminum housing Variable power settings ¼? NPT air line coupler included.