Air Die Grinder, 1/4-Inch Pneumatic Straight Die Grinder, Air-Powered Die Grinder for Grinding, Cutting, Polishing This straight die grinder weighs less than one pound and can reach up to 22000RPM continuous power, suitable for welding repair, fabrication, cutting, polishing, grinding, and general machining for Automotive Pros. Air Straight Die Grinder with 10-Pieces Air Die Grinder Stone Set，22000 RPM, Pneumatic Tools, Equipped with 1/4-inch, 1/8-inch collets and 2 wrenches High-precision material cylinder, wear-resistant and durable This pneumatic die grinder has a unique latch attached to the trigger mechanism that acts as a child safety lock to prevent the tool from accidentally starting up Lightweight & Ergonomic Designed Body - The air die grinder features a slim design. The air inlet filter could keep the die grinder from contamination. High Free Speed - The Pneumatic straight die grinder operates at a maximum speed of 22,000 RPM continuous power with an air compressor, allowing precision cutting, grinding, shaping, and sanding Package 1 x PC Air Die Grinder with 1/4" Collet2 x PC Small hand Wrenches1 x PC 1/8" Collet1 x PC 1/4" FNPT connector10 x PC Grinding stone bits (5 Mounted Stones 1/4" Shanks, 5 Mounted Stones 1/8" Shanks Specifications Free Speed : 22,000 Rated R.P.M.Air Inlet : 1/4” FNPT Collet : 1/4" and 1/8"Recommended Air Pressure : 0.63 Mpa / 90 PSI