Diamond Polishing Pads 4" inch Wet/Dry Set of 11+1 Backer and DAMO Black Buff Pads for Granite Polishing & Glazing/ Final Buffing Pads Best Value Granite Concrete 11 Pieces of 4 Inch Diamond Polishing Pad (3mm Thick) for concrete stone and 1 backer. 11 Pads are: 2 X Grit 50 100 200, 1 X Grit 400 800 1500 3000 10000Super buff. 1 Pcs of 4 Inch DAMO Black Buff Pads for Granite Polishing & Glazing/ Final Buffing Pad. 1 Pcs Velcro 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.