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 1/4" NPT air line coupler included Free Speed: 7,500 rpm Maximum Torque: 420 ft.-lbs. Recommended Air Pressure: 90 psi Average Air Consumption: 5 SCFM Air Inlet Size: 1/4" NPT Recommended Air hose Size: 3/8" ID Tool Length: 7.3" Tool Weight: 5.7 lbs.