Remind: The pad holder and cup wheel’s arbor is 5/8-11 female thread. Pad Holder’s max velocity / capacity is 5000 RPM. Please do not use it with high speed grinder or polisher. Cup wheel color is now RED. 115 Pieces of 4 Diamond wet dry (wet use recommended) Polishing Pad for granite marble concrete. 8 Pieces of 4 / 4 Inch Double Row Grinding Cup Wheel for concrete stone. 5/8-11 female thread arbor cup wheel color is now RED. 1 Piece of (5/8″-11 Female Thread arbor) 4″ Velcro Backer/Pad Holder. 115 Pieces 4 Diamond Polishing Pad for granite marble concrete. 22 X Grit 50 100 200. 13 X Grit 400. 9 X Grit 800 1500 3000 6000. 3.2mm thickness. Recommend 2500 – 5000 rpm (grinder or polisher speed must be lower than 5000 RPM). Wet or dry use (wet use recommended).