320 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. This 10 Pack of 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.