Remind: This velrco backer’s arbor is 5/8-11 female thread. Remind: Velcro Backer’s max velocity / capacity is 5000 RPM, please don’t use it with high speed grinder/polisher. 37 Pieces of 6 Diamond Polishing Pad for stone concrete marble granite. 3 Pieces of FREE GIFT 6 velcro Backer / Pad Holder. (5/8-11 Female Thread arbor). Remind: Rubber Backer’s max velocity / capacity is 5000 RPM, please don’t use it with high speed grinder/polisher. 37 Pieces of 6 Diamond wet dry (wet use recommended) Polishing Pad for granite marble concrete stone. 7 Pieces X Grit 50 100. 6 Pieces X Grit 200 400. 3 Pieces X Grit 800 1500 3000. 2 Pieces X Grit 6 000. 3 Pieces of 6″ (5/8″-11 Female Thread arbor) Velcro Backer / Pad Holder. Remind: velcro Backer’s max capacity is 5000 RPM, please don’t use it with high speed grinder/polisher. Recommend 3500 – 5000 rpm (grinder or polisher speed must be lower than 5000 RPM). Wet or dry use (wet use recommended).