Remind: Rubber Backer’s max velocity / capacity is 5000RPM, please don’t use it with high speed grinder/polisher. 12 Pieces of 7 More diamond more long lasting honeycomb Polishing Pad for granite marble concrete glass quartz. 1 Piece of FREE GIFT 7 Rubber Backer/Pad Holder. (5/8-11 Thread arbor). 12 Pieces of 7 Diamond Polishing Pad for granite marble concrete stone. 2 X Grit 50 100 200 400. 1 X Grit 800 1500 3000 10000.. 1 Piece of 7″ (5/8″-11 female Thread arbor) FREE GIFT Rubber Backer/Pad Holder. Recommend 3500 – 5000 rpm. Wet or dry use (wet use recommended).