Remind: The velcro pad holder and 5 cup wheel 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. 50 Pieces of 4 Diamond Premium Grade wet DRY (dry use recommended) Polishing Pad for granite marble concrete quartz ceramic stone travertine. 5 Pieces of 4 / 4 Inch (Ultra Wide Segment) Turbo Row Grinding Cup Wheel for concrete stone surface grinding. Cup wheel is random color: Red or Blue or Black. 1 Piece of (5/8″-11 Female Thread arbor) 4″ Velcro Backer/Pad Holder. Velcro backer’s max velocity / capacity is 5000RPM. Please don’t use it with high speed grinder / polisher. 4 Diamond DRY Polishing Pad for granite marble concrete. 9 X Grit 50 100 200 400. 4 X Grit 800 1500. 3 X Grit 3000 Buff. Recommend 2500 – 5000 rpm. Wet dry use (dry use recommended).