Lever Start, Sliding Knb Reverse 3/8" square drive, #10 bolt size, 1250 RPM, Max Torque 2.7 ft.-lbs.( Maximum torque of tool exceeds the maximum torque rating for the Head. High maintenance should be expected when operated at the upper torque capacity range.) Air Inlet 1/8" NPT, Minimum Hose Size 3/16". Tool performance rated at 90 psi air pressure.