Pad holder’s max velocity / capacity is 5000 RPM. Please do not use it with high speed grinder or polisher. (a) 1 Piece of 4″ and 1 Piece of 5″ Polishing Pad Holder (5/8-11 Female Thread arbor). (b) 34 Pieces of 4 Premium wet DRY (dry use recommended) Diamond Polishing Pad for granite marble concrete. 7 X Grit 50 100 200 400. 2 X Grit 800 1500 3000. (c) 11 Pieces of 5 Premium wet DRY (dry use recommended) Diamond Polishing Pad for granite marble concrete. 2 X Grit 50 100 200 400. 1 X Grit 800 1500 3000. 2.4mm thickness. Recommend 2500 – 5000 rpm (grinder speed must be lower than 5000 RPM).