Remind: The velcro pad holder, cup wheel and core drill bit’s arbor is 5/8-11 female thread. Important Remind: Velcro backer’s max velocity / capacity is 5000RPM. Please don’t use it with high speed grinder / polisher. (a) 1 Piece of 4 Diamond Turbo Row Grinding cup wheel for concrete granite travertine. (with 5/8-11 female thread arbor). (b) 34 Pieces of 4 Diamond Polishing Pad for granite marble concrete. 7 X Grit 50 100. 6 X Grit 200 400. 2 X Grit 800 1500 3000 10000. 3.2mm thickness. Recommend 2500 – 5000 rpm (grinder or polisher speed must be lower than 5000 RPM). Wet or dry use. (c) 1 Piece of 1 1/4″ / 32 mm (Ultra High Segment: 9mm High) Diamond Core Drill Bit for concrete granite quartz (with 5/8″-11 female thread arbor). (d) 1 Piece of (5/8″-11 female Thread arbor) 4″ Velcro Backer/Pad Holder.