This package carries (a)-(c). Their arbor is 5/8-11 Female Thread. VERY IMPORTANT REMIND: Velcro Backer’s max velocity / capacity is 5000 RPM. Please don’t use it with high speed grinder/polisher. (a) 1 Piece of F30 (30 mm / 1 1/4 ” ogee Bullnose) Router Bit/Profile for 30 MM HIGH OR THICK CONCRETE STONE travertine (5/8″-11 female Thread arbor). (b) 1 Piece of 4 / 100 mm Professional Grade Glaze Buffing Pad (it brings natural granite marble stone mirror like polished result). (c) 25 Pieces of 4 / 100 mm Diamond Polishing Pad for granite marble concrete. 5 X Grit 50 100 200. 4 X Grit 400. 2 X Grit 800 1500 3000. And 1 Piece of 4″ / 100 mm Velcro Backer/Pad Holder (5/8″-11 female Thread arbor). Please don’t use with high speed grinder/polisher. With water feed hole, can be wet use.