Drive Square: 19 mm (3/4") Speed Without Load: 4000 RPM Maximum Torque: 1600 Nm/1180 ft Double Hammer System Air usage: 256 L/min (9 cfm) Air pressure: 90 psi (6.2 bar) Length: 9.2 inches or 234 mm Weight: 13 pounds (5.9 kg) Air Hose:1/2" Air Inlet:3/8"