Diamond Polishing Pads 4 inch Wet/Dry 55 Piece Set Pad Granite Concrete 55 Pcs of 4" Polishing Pad+1 Pcs 4" Rubber Backer (5/8 Thread) They are: 8 Pcs X Grit 50 100 200 400 800, 7 Pcs X Grit 1500, 4 Pcs X Grit 3000 6000Buff, 1 Pcs of 4" Rubber Backer/Pad Holder (5/8 Thread)