... bits for various types of stone Electro-plated diamond core drill bit (hole saw) :-Fast, clean and efficient way to core holes ... Ø3mm to Ø127mm(2). Shank/Top: Round, Trigonal, Hex (3). Diamond grit: D427, D252, D181 and cutting thickness upon coating grit ... as your requirement (6). Used to drill marble, ceramics, porcelain, tile, glass, fiberglass, quartz, bricks, and a variety of other materials ...