75 Pieces of 5 / 125 MM (3.2mm Thickness) Diamond wet dry (wet use recommended) Polishing Pad for granite marble concrete. 30 X Grit Grit 50. 15 X Grit 100 200 400. 3.2mm thickness. Recommend 3500 – 5000 rpm (grinder or polisher speed MUST be lower than 5000 RPM). Wet or dry use (wet use recommended).