Master Mechanic, 1/2", Air Impact Wrench, 650 FT/LB Of Max Torque, 7500 No Load RPM, Twin Hammer Mechanism For Balanced Impacts, Durable Aluminum Housing With Rubber Grip, 1/2" Square Drive, Adjustable Torque Output With Built In Regulator, 99 Db Noise Level, 6.5 CFM Air Consumption, 1/4" Inlet.