This Black & Decker 6" polisher/grinder can do two jobs. It is part of the Black & Decker "PROFESSIONAL PRODUCTS" line and spins at 4,000 RPMs. It is "impossible" to stop this tool from grinding or polishing. It comes with a polishing wheel, however, you can switch to Scotch bright or dozens of sandpapers or grinding stones. This is a very versatile shop tool if you are working with aluminum or steel. There is No tool that has the power this tool has.