Impact Wrench Power Source Air Powered Air Consumption 4.45 cfm Air Inlet 1/4 in NPT Air Pressure 91 psi Max Air Pressure 91 psi Min Hose Size 3/8 in Duty Rating Industrial Duty Breakaway Torque 715 ft-lb Fastening Torque 510 ft-lb Free Speed 10 000 RPM Impact Sound Level 104 dB Number of Speed Settings 4 Power to Weight Ratio 138 ft-lb/lb Max Bolt Capacity 1/2 in Drive Size 1/2 in Square Drive Type Extended Retainer Type Friction Ring Clutch Style Double Dog