... in counter tops.-Discharge hole for dust removal-Straight shank fits all drill chucks-Top of the line core bits for various ... ; Blister; or as your requirement (6). Used to drill marble, ceramics, porcelain, tile, glass, fiberglass, quartz, bricks, and a variety of other ... life. (8). It is very easy to assemble and use with or without center pin. Electroplated diamond core drill bit with centre drill