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. 22 Pieces of 5 Diamond Polishing Pad for granite marble concrete. 1 Piece of 5 / 5 Inch (Super Wide Segment) Turbo Row Grinding Cup Wheel for concrete stone. 1 Piece of (5/8″-11 Thread) 5″ Rubber Backer/Pad Holder. 6 X Grit 50. 4 X Grit 100 200 400. 1 X Grit 800 1500 3000 6000. Pad thickness is 3mm. Recommend 2500 – 5000 rpm (grinder or polisher speed must be lower than 5000 RPM). Wet or dry use (wet use recommended).