This package carries (a)-(d). 1 Piece of V30 (1-1/4 / 30mm) for 30mm / 1-1/4 Inch high / thick granite marble concrete quartz glass countertop / vanit top edge bullnosing Diamond Brazed Router Bit to do Full shape bullnose. The inner hole of this router bit is 7/8″ to 5/8″. It works with grinder or polisher with 5/8-11 Thread spindle. Important Remind: Please make sure that your grinder or polisher speed is below 5000 RPM when using with it. (b) One Lock Ring Nuts and wrench set (the pairs of lock ring nut is necessory to attach the router bit to your 5/8-11 thread spindle grinder / polisher). (c) 1 piece of 4″ Velcro Backer / Pad Holder (5/8″-11 Thread). (d) 30 Pieces of 4 Inch Diamond Polishing Pad for granite marble glass stone concrete (wet and dry use, wet use recommended). 6 X Grit 50 100 200. 5 X Grit 400. 2 X Grit 800 1500 3000. 1 X Grit 6000.