Description: HEAVY DUTY AIR IMPACT SCREWDRIVER Lightweight aluminum housing.Double hammer system. 360degree adjustable air regulator for variable speed.Reversible switch.Quick change chuck. Designed for all screwing and unscrewing jobs with the max.screw size 4.0mm. Rear exhaust. Parameters: Hex shank size: 1/4" Capacity: 5/32"-3/16" Free speed:8,000rpm Max torque:30-80in-lbs Air inlet (PT): 1/4" Air hose (ID): 3/8" Avg.air consumption: 6cfm Working pressure: 90psi Qty per carton: 20pcs Carton meas.:27x25x24cm