This tough Ingersoll Rand air impact wrench is great to have around the auto shop. Its single hammer impact mechanism is durable and it boasts an easy-to-use forward/reverse power regulator for control. Long-life aluminum housing. Drive (in.): 1/2, Average Air Consumption (CFM): 4.3, CFM at Load: 24, Speed - No Load (RPM): 7,400, Max. Torque (ft.-lbs.): 450, Inlet Size (in.): 1/4, Min. Hose Size (in.): 3/8, Variable Speed: Yes