Smooth rough edges, and level surfaces with the Buffalo Tools 1/4-Inch Air Die Grinder. This 22,0000 RPM variable speed Grinder is ideal for use in your home workshop, but is still powerful enough to be used in a more commercial setting for metal working and construction. A free mounted stone set is included for buffing, polishing, sanding and removing rust and paint. Fits 1/4-Inch collets and 1/4-Inch NPT air inlet. Get big power out of a small device with air tools by Buffalo Tools. Air tools are ideal for use in handyman workshops, auto shops, and home garages where an air compressor and hose are within reach of the project. These palm sized devices deliver more power than tools many times their size, without filling your space with bulky tools that have to compete for space at the power outlet.