Master Mechanic, 1/4", Straight, Die Grinder Kit, Ideal For Porting, Weld Breaking, Smoothing Sharp Edges, Deburring, Polishing & Grinding Applications, 2500 RPM Variable Speed, 1/4" Collet, Sealed Ball Bearing Construction For Durability, Heavy Duty Aluminum Housing Comfort Grip, Lightweight Body, Safety Lever Prevents Accidental Starts, Rear Exhaust, 3 CFM At 90 PSI Air Consumption, Includes: 10 Grinding Stones, 2 Wrenches, Nipple, 1/4" Collet & Carrying Case.