... performance: High speed,Smooth cut. Electro-plated diamond core drill bit (hole saw) :-Fast, clean and efficient way to ... hole for dust removal-Straight shank fits all drill chucks-Top of the line core bits for ... hang bag; Blister; or as your requirement (6). Used to drill marble, ceramics, porcelain, tile, glass, fiberglass, quartz, bricks ... or without center pin. Electroplated diamond tile drill bit