Remind: The pad holder and cup wheel’s arbor is 5/8-11 female thread. (a) 22 Pieces of 5 Diamond Polishing Pad wet dry use. WET USE RECOMMENDED for granite marble concrete travertine quartz sandstone. 5 X Grit 50 100. 4 X Grit 200 400. 1 X Grit 800 1500 3000 6000. 3 Pieces of 5″ Diamond Turbo Row Grinding Cup Wheel for concrete stone terrazzo travertine surface grinding (with 5/8″-11 Female Thread arbor). 1 Piece of (5/8″-11 Female Thread arbor) 5″ aluminum Velcro Backer/Pad Holder. Pad 3mm thickness. Recommend 2500 – 5000 rpm (grinder or polisher speed must be lower than 5000 RPM when using with polishing pad). Wet or dry use (wet use recommended).