... 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 , ... DILLLING DEPTH 30MMWITH 2 pilot drill bits. one diamond tipped and one tungsten pilot drill bits ALLAN ... of metal packing box as below, Diamond Dust Tipped Glass cutting Hole Saws