Diamond Polishing Pads 3" inch Wet/Dry Set of 19+1 Rubber Backer Pad Best Value Granite Concrete 19 Pcs of 3 Inch Diamond Polishing Pad (3mm Thick) for concrete stone and 1 backer. 19 Pads are: 3 X Grit 50 100 200 400 800, 2 X Grit 1500, 1 X Grit 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. http://www.amazon.com/dp/B0744CWP2W