(a) 1 Piece of V40 (1 1/2" / 40 mm) for 40 mm high / thick stone or travertine or concrete countertop / tile edge router bit to do Full bullnose (with 5/8"-11 Thread arbor). (b) 7 Pieces of 2" / 50 mm Wet Polishing Drum for granite marble concrete sink / basin hole / sink cutouts / tight radius (with 5/8"-11 Thread arbor) They are: 1 Piece of Grit 50 100 200 400 800 1500 3000. (c) 1 Piece of 2" / 50 mm Diamond core bit / hole saw / cutter for stone concrete (5/8"-11 thread arbor). (d) 1 Piece of 2" / 50 mm Diamond Zero Tolerance Grinding drum for sink hole inner coarse grinding / polishing (5/8"-11 thread arbor). 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.