3 Pack of 3/16" Diamond Core Drill Bit For Glass and Tile | Free Beginner's Glass Drilling Guide | Ideal for Drilling Wine Bottles 3/16" Diamond Core Bit for Glass and Tile; Fits your handheld 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. You'll drill glass, tile, cearmics, porcelain and stone