... line core bits for various types of stone Drill: Mini Drill Core Bit Drilling Tiles :-Fast, clean and ... to Ø8mm(2). Shank/Top: Round, Trigonal, Hex (3). Diamond grit: D427, D252, D181 and cutting thickness upon ... bag; Blister; or as your requirement (6). Used to drill marble, ceramics, porcelain, tile, glass, fiberglass, quartz, ... use with or without center pin. Drill: Mini Drill Core Bit Drilling Tiles