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The Astro Pneumatic 1812L 1/2" Impact Wrench with 2" Anvil - Twin Hammer is ideal for general automotive work, light truck, farm, body shop, tire shop and front-end work. Durable twin hammer impact mechanism. Anvil and rotor made of special alloyed steel that is heat treated to prevent chipping or breaking. Steel hammer case provides maximum protection. Two piece construction for easy maintenance. Pressure feed lubrication system. Specifications: Square Drive: 1/2" , Free Speed: 7,000rpm, Overall Length: 6-3/4" (172mm), Net Weight: 5-3/5lbs. (2.60kg), Max. Torque: 400-Feet/lbs., Bolt Capacity: 9/16" (14mm), Air Inlet Thread NPT: 1/4", Air Hose I.D. Size: 3/8" (10mm), Avg. Air Consumption.: 4.20cfm, Air Pressure: 90-120psi.