1 1/4" Ogee Bullnose Bit 1 3/8" granite marble porcelain ceramic grinding drum

With 5/8"-11 female Thread arbor. (b) 1 Piece of 1 3/8" / 35 mm Diamond Zero Tolerance Grinding Drum Wheel (with 5/8"-11 female Thread arbor) to do sink hole drum inner hole grinding / polishing.

eBay