Ingersoll Rand 1770G 1/2-Inch Edge Series Drive Air Ratchet, Black 1/2-Inch Drive Powerful motor delivers 55-Feet-pound of torque and 170 rpm of free speed Heat-treated ratchet head for longer life Average Air Consumption: 3 cfm and/or 85 l/min and Free Speed Air Consumption: 20 cfm and/or 566 l/min