5" Inch Diamond Polishing Pads Set of 14 Granite Marble Concrete Ceramic 13 Pcs of 5" Diamond Polishing Pad (3mm Thick) for concrete stone and 1 backer. 13 Pads are: 2 X Grirt 50 100 200 400 800, 1 X Grit 1500 3000 10000Super Buff. 1 Pcs Rubber Backer (5/8" Thread arbor). Backer has water feed hole, wet polishing no problem. Remind: Velcro Backer's max capacity is 5000RPM. Please don't use it with high speed grinder.