Diamond Polishing Pads 4" inch Wet/Dry Set of 11+1 Backer Pad Best Value Granite Concrete

4" Diamond Polishing Pad for concrete stone 11 Pcs and 1 Rubber backer. 11 Pads are: 2 X Grit 50 100 200 1 X Grit 400 800 1500 3000 6000. 1 Pc Rubber Velcro Backer (5/8" Thread arbor). Backer has water feed hole, can do wet polishing. The set works well for wet or dry polishing of stones, wet polishing may give better shine of specific stones. Remind: Velcro Backer's max capacity is 4500 RPM. Please don't use it with high speed grinder.