The Chicago Pneumatic 3/4in. air impact wrench offers powerful performance and durability in a compact package. Drive (in.): 3/4, Average Air Consumption (CFM): 7.5, Speed - No Load (RPM): 6,300, Blows Per Minute (BPM): 850, Max. Torque (ft.-lbs.): 1,200, Inlet Size (in.): 3/8, Min. Hose Size (in.): 3/8