400 Grit PVA Abrasive wheel abrasive polishing wheel set is made for a wide range of grinding, blending and polishing on metal surfaces, marble, travertine, onyx and general masonry materials. Polishing wheels are color coded for easy identification. These resin-bonded discs are designed to withstand the friction of dry polishing. 11,400 Max RPM’s with a 5/8″ Bore. Made of silicon carbide abrasive material. DTA is has been servicing the tile and fabricating contractors for over 40 years.