Important Remind: Pad Holder/ backer’s max velocity / capacity is 5000RPM. Please don’t use it with high speed grinder / polisher. Remind: The 7″ / 180mm velcro pad holder and 5″ / 125mm cup wheel’s arbor is 5/8-11 female thread. 8 Pieces of 7 / 7 Inch / 180mm Higher Diamond Concentration and Longer Life Polishing Pad for granite marble concrete. 3 Pieces of 5 / 5 Inch / 125mm (Ultra Wide Segment) Turbo Row Grinding Cup Wheel for concrete stone. 1 Piece of (5/8″-11 female Thread arbor) 7″ Velcro Backer/Pad Holder. 7 Diamond wet dry (wet use recommended) Polishing Pad for granite marble concrete. 1 X Grit 50 100 200 400 800 1500 3000 10000. 3.2mm thickness. Recommend 2500 – 5000 rpm. Wet or dry use (wet use recommended).