3 Pack of 1/4" Diamond Core Drill Bits For Glass and Tile | Free Beginner's Glass Drilling Guide | Ideal for Drilling Tile, Glass Bottles 3 Pack of 1/4" Diamond Core Bit for Glass and Tile: Fits your hand drill or drill press FREE 4 page drilling instruction guide. FREE shipping in the US. No risk - 100% money back guarantee EASY - Use your kitchen scrubbing sponge to hold the glass and cool the bit. Well show you how. Youll make glass mplate flowers, lighted glass block, bird feeders and more