... of the line core bits for various types of stone Drill: Step Drill Core Bit for Water Drilling:-Fast, clean and efficient ... tops.-Discharge hole for dust removal-Straight shank fits all drill chucks-Top of the line core bits for various types ... hang bag; Blister; or as your requirement (6). Used to drill marble, ceramics, porcelain, tile, glass, fiberglass, quartz, bricks, and a ...