Packed with power and speed, this heavy-duty air impact wrench is the right tool for general automotive service, body shop, farm and light truck work. Low air consumption and high torque make this tool the most efficient in its class. Drive (in.): 1/2, Average Air Consumption (CFM): 4.75, CFM at Load: 19, Speed - No Load (RPM): 6,900, Max. Torque (ft.-lbs.): 550, Working Torque (ft.-lb.): 25 - 400, Inlet Size (in.): 1/4, Min. Hose Size (in.): 3/8, Variable Speed: Yes