55 Pieces of 4 / 100mm Diameter Diamond Wret Dry (wet use recommended) Polishing Pad for granite concrete marble wet polishing. Pad Thickness is 3.2mm. Grinderi or polisher must be lower than 5000 RPM when using with them. Wet and dr use. 11 X Grit 50 100. 10 X Grit 200 400. 4 X Grit 800. 3 X Grit 1500 3000 6000.