Resources ACDelco Tool Manual - ANI404 ANI404 1/2" Composite Impact Wrench - 650 ft-lbs Features Front exhaust design. Forward: 3 speed; reverse: 1 speed. Light and composite material housing Powerful and durable impact mechanism TWIN HAMMER. Specifications Model Number ANI404 Square Drive 1/2" Square Max. Torque 650 ft-lbs (880 Nm) Standard Bolt Size 3/4" (M19) Free Speed 7,000 RPM (/min) Air Consumption 4.5 CFM (127 l/min) Overall Length 7-13/16" (198 mm) Air Inlet 1/4" Air Pressure 90 PSI (6.2 Bar) Air Hose 3/8" (10 mm) Sound Pressure Level (LpA) 97.66 dB(A) Sound Power Level (LwA) 108.66 dB(A) Vibration Level 15.98 m/sec^2 Net Weight 4.36 lbs (1.98 kg)