This package carries (a)-(d): (a) 1 Piece of F20 Router Bit (3/4". For 20 MM Thick or High stone concrete travertine to do Ogee shape bullnose). Its arbor is 5/8"-11 Thread. (b) 1 Piece of F30 Router Bit (1 1/4". For 30 MM Thick or High stone concrete travertine to do Ogee shape bullnose). Its arbor is 5/8"-11 Thread. (c) 1 Piece of 1 3/8" (35 mm diameter) 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. (d) 1 Piece of 2" (50 mm diameter) 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.