Damo Diamond Tools 4FPP127SETB4SRBH  4-Inch Wet Diamond Polishing Pads Granite Polish/Concrete Polisher Pads diameter 4", thickness 2.7mm; One piece each of grit 50,100,200,400,800,1500, 3000, Black Buff; Free DAMO semi-rigid back holder ; For granite, concrete, marble, engineered stone; Wet applications only, optimal speed RPM 3,000-4,000.