Remind: The arbor of this cup wheel, Diamond zero tolerance drum and core bit TWO IN ONE and the B5 router bit is 5/8"-11 Thread. NOT M14 Thread. This package carries (a)-(c): (a) 1 Piece of B5 (3/16" / 5 mm) Diamond Counter top table top Demi / Radius shape Bullnose router bit for 5 MM High or Thick stone concrete travertine (5/8"-11 Thread arbor). (b) 1 Piece of 4" Diamond Turbo Row Grinding cup wheel for stone concrete surface grinding / smoothing (5/8"-11 Thread arbor). (c) 1 Piece of 2" (50 mm) Diamond Zero tolerance grinding drum wheel and core bit TWO IN ONE (5/8"-11 Thread). Save time save money. The height of working layer is 50 MM. This tools do the stone concrete travertine hole cutting and the inner hole polishing at the same time.