Remind: The pad holder and router bit arbor is 5/8-11 Female Thread. Pad Holder’s max capacity / veocity is 5000 RPM. Please do not use it with high speed grinder / polisher. The 4 Inch polishing pad. This package carries (a)-(d). (a) 1 Piece of V50 (50mm / 2″ Full Shape Bullnose, for 50MM HIGH OR THICK STONE CONCRETE) to do Full shape bullnose Diamond Brazed Router Bit/Profiler (5/8″-11 Female Thread arbor). (b) 1 Piece of 4″ / 4 Inch velcro Backer / Pad holder (5/8″-11 female thread arbor). (c) 1 Piece of 4 / 4 Inch velcro backed Diamond Turbo Grinding cup wheel for stone concrete surface grinding / smoothing. (d) 7 Pieces of 4 / 4 Inch Ultra Thick (10MM Thickness) Diamond wet dry (wet use recommended) polishing pad for granite marble concrete. 1 X Grit 50 100 200 400 800 1500 3000.