... to core holes in counter tops. -Top of the line core bits for various types of stone Electro-plated ... fits all drill chucks-Top of the line core bits for various types of stone(1). Diameter: from Ø3mm to ... Used to drill marble, ceramics, porcelain, tile, glass, fiberglass, quartz, bricks, and a variety of other materials. (7). It gives ... and use with or without center pin. Set of diamond core drill bit