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. Variable Speed: Yes, Min. Hose Size (in.): 3/8, Inlet Size (in.): 1/4, Drive (in.): 1/2, Average Air Consumption (CFM): 3.5, Max. Torque (ft.-lbs.): 425, Case Included: Yes, Working Torque (ft.-lb.): 25-310, Tool Length (in.): 7 3/8