1 1/2" lapidary travertine concrete sink hole core bit polishing grinding drum

(b) 6 Pieces of 1 1/2" Wet Polishing Drum for granite marble concrete sink / basin hole / sink cutouts / tight radius (with 5/8"-11 Female Thread arbor). (c) 1 Piece of 1 1/2" Diamond Brazed / Electroplated Zero tolerance grinding drum wheel for sink hole inner coarse grinding / polishing (5/8"-11 Femal Thread arbor).

eBay