Important Remind: The router bit and pad holder arbor is 5/8"-11 Thread. Velcro backer's max capacity is 5000 RPM. Please do not use it with high speed grinder / polisher. This package carries (a)-(c): (a) 1 Piece of B13 (13 mm / 1/2" Radius / Demi / Half / Roundover Bullnose) Diamond Brazed Router Bit / Profile for 13 MM THICK OR HIGH STONE CONCRETE (5/8"-11 Thread arbor). (b) 1 Piece of 4" Professional Grade Glaze Final Buffing Pad (it brings natural stone granite marble mirror like polished result). (c) 11 Pieces of 4" Diamond Polishing Pad for granite concrete marble stone: 2 X Grit 50 100 200 400, 1 X Grit 800 1500 3000, and 1 Piece of 4" Velcro Backer / Pad Holder (5/8-11 Thread). REMIND: Velcro backer's max capacity is 5000 RPM. Please do not use it with high speed grinder / polisher.