TEKTON 1/4" REAR-EXHAUST DIE GRINDER features: Die Cast Aluminum Body, Compact, Lightweight Body Allows Access to Tight Areas, Lever Throttle for Precision Control, Ball Bearing Motor, Collet Size: 1/4", Maximum Speed: 22,000 RPM, Working Air Pressure: 60 psi, Average Air Consumption: 6 CFM, Air Inlet: 1/4", Minimum Air Hose Size: 3/8", 1-pc. Die Grinder, 2-pc. Chuck Wrenches.