Angle Die Grinder,301B, Duty Medium Duty, Horsepower 0.3 hp, Collet Size 1/4 in; 6mm, Grinder Orientation Angle, Max. Speed 21,000 RPM, Air Inlet 1/4 in, Includes Tool, (2) Wrenches, 1/4 In. and 6mm Collet, Safety Features Safety Lock Lever, Power Source Air Powered