Mountain 7226A 1/4-Inch Drive Stubby Air Ratchet Square drive: 1/4; Free speed: 240rpm Overall length: 6-1/2 (165mm); Net weight: 1-1/8lbs. (.5kg) Max. torque: 30ft./lbs; Bolt capacity: 1/4 (6mm) Air inlet thread NOT: 1/4; Air hose I.D.size: 5/16 (8mm) Avg. air consumption: 3cfm.; Air pressure: 90-120psi