Capacity Bolt Standard: 10-18mm (3/8″-23/32″) Bolt High Tension: 8-14mm (5/16″-9/16″) Tightning Torque: 185-250N-m (136-2,210.-lbs.) Square Drive: 12.7mm(1/2″) Power Input 420W No-Load Speed High: 0-2,300/min Low: 0-1,800/min impact Rate High: 0-2,800/min Low: 0-2,100/min overall Length 248(9-3/4″) Weight 2.2kg