Diamond Polishing Pads 6 inch Wet/Dry 12+1 Piece Set Pad Granite Concrete 6" Diamond Polishing Pad concrete granite 12+1 Pieces 12 Pads are: 2 Pcs X Grit 50 100 200 400, 1 Pcs X Grit 800 1500 3000 Buff 1 Pcs X 6" Rubber Backer/Pad Holder (5/8 Thread) Rubber Backer's max capacity is 5000RPM. Please don't use it with high speed grinder/polisher.