The arbor of the 5 Inch Pad holder and drums is 5/8"-11 Thread. Not M14. (a) 1 Piece of 5" Diamond Cutting Blade for stone concrete granite. The inner hole diameter is 7/8" to 5/8". (b) 1 Piece of 5" / 125 mm Velcro Polishing Pad Holder (5/8"-11 Thread arbor. Velcro pad holders max velocity is 5000 RPM. Please do not use it with high speed grinder polisher). and 8 Pieces of 5" / 125 mm Diamond Polishing Pad for concrete granite stone: 1 X Grit 50 100 200 400 800 1500 3000 6000. (c) 7 Pieces of 1 3/8" / 35 mm Wet Polishing Drum for granite marble concrete sink / bhole / sink cutouts / tight radius (the arbor of them is 5/8"-11 Thread) They are: 1 Piece of Grit 50 100 200 400 800 1500 3000. Fits on wet / water-fed polisher, Wet and Dry Use, Wet use recommended. -Vertical oscillation recommended for even wear; -Ideal speed (of polisher / grinder) capacity is 4000 RPM, Not be higher than 5000 RPM.. Wet Diamond Polishing Drum Wheel is designed for wet polishing of sink cutouts or tight radius. A complete set usually comes with grit 50,100, 200,400, 800, 1500, 3000. Polish from grit 50 to 3000 respectively.