You can cut a range of size holes in GLASS, TILES, SLATE, MARBLE ,GRANITE with ease!!! Diamond tiped hole saw (Core Bit)You can cut holes in GLASS, TILES, SLATE, MARBLE ,GRANITE with ease,A whole range from 15mm to 100mm MAX DILLLING DEPTH 30MMWITH 2 pilot drill bits. one diamond tipped and one tungsten pilot drill bits ALLAN KEY ALSO INCLUDED Best used wetAfter using, clean & wipe down with oil ...