1 1/4" Shark Thin Wall Porcelain Tile Core Bit

Diamond-tip core bits have hollow centers surrounded by cutting edges that have been coated with diamond abrasives to allow the bits to grind through porcelain, tile, and other very hard materials. They are typically used for drilling larger holes than would be possible with arrow-tip drill bits for glass and tile. The bits cut through the perimeter of the hole during drilling and leave a solid slug of material that can be ejected through a side slot on the bits.