Worlds most famous! Dyna Pact clutch provides high torque and fast run-downs. Big power for auto mechanical and body shop, farm and truck repair work and more. Drive (in.): 1/2, Average Air Consumption (CFM): 3 1/2, Max. Torque (ft.-lbs.): 425, Working Torque (ft.-lb.): 25 - 310, Inlet Size (in.): 1/4, Min. Hose Size (in.): 3/8, Variable Speed: Yes, Tool Length (in.): 7 3/8, Case Included: Yes