Impact Wrench Power Source Air Powered Air Consumption 20 cfm Air Inlet 1/4 in NPT Air Pressure 90 psi Max Air Pressure 90 psi Min Air Pressure 90 psi Min Hose Size 3/8 in Exhaust Location Bottom Duty Rating General Duty Breakaway Torque 450 ft-lb Fastening Torque 305 ft-lb Free Speed 9 900 RPM Impact Rated Yes Impact Sound Level 103 dB Impacts per Minute 1 700 Number of Speed Settings 3 Power to Weight Ratio 161.9 ft-lb/lb Max Bolt Capacity 1/2 in Drive Size 1/2 in Square