Remind: The 5/8-11 Female Thread arbor aluminum velcro backer/pad holder are with water feed hole, can be used for wet polishing. This package carries (a)-(d). (a) 11 Pieces of 7 Diamond Resin wet dry (wet use recommended) Polishing Pad for granite marble concrete. 2 X Grit 50 100 200 400. 1 X Grit 800 1500 3000. (b) 1 Piece of 7 Diamond glaze buffer (it brings mirror like polished result to natural granite marble). (c) 1 Piece of 7 Diamond flat grinding cup wheel (Grit 30, velcro backed) for stone concrete surface coarse grinding. (d) 1 Piece of 7″ aluminum pad holder (5/8″-11 Female Thread arbor). 3.2mm thickness. Recommend 3500 – 5000 rpm (grinder or polisher speed must be lower than 5000 RP). Wet or dry use (wet use recommended).