Best 65mm core drill bit
Dry Drill Core Bits for Brick, Concrete Block, Masonry - 2" Diameter 5/8"-11 Threaded #30/40 Diamond GritSHDIATOOL Diamond Core Drill Bits 2-1/2 Inch for Porcelain Ceramic Tile Marble Brick Vacuum Brazed Hole saw 65mmDry Core Bit for Brick and Concrete Block with Pilot Bit - 3" Diameter - 1/2" ...