Remind: The rubber pad holder and cup wheel’s arbor is 5/8-11 female thread. Important Remind: Rubber backer’s max velocity / capacity is 5000RPM. Please don’t use it with high speed grinder / polisher. 25 Pieces of 5 Diamond Polishing Pad for granite marble concrete. 3 Pieces of 5 / 5 Inch (Ultra Wide Segment) Turbo Row Grinding Cup Wheel for concrete stone. 1 Piece of (5/8″-11 female Thread arbor) 5″ Rubber Backer/Pad Holder. 5 Diamond Polishing Pad for granite marble concrete. 5 X Grit 50 100 200. 4 X Grit 400. 2 X Grit 800 1500. 1 X Grit 3000 6000. 3.2mm thickness. Recommend 2500 – 5000 rpm. Wet or dry use.