1/2" Diamond Core Drill Bit For Glass and Tile | Put 2 in Your Cart, We'll ship the 3rd FREE | Free Beginner's Drilling Guide | Drill Glass, Tile, Wine Bottles, Glass Block 1/2" Diamond Core Bit for Glass and Tile; Buy 2 get the 3rd one FREE FREE 4 page drilling instruction guide. FREE 5 page decorating ideas 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 wine bottle lamps, lighted glass block, bird feeders and more