Free Drilling Guide | 5 Pk of 1/2" Diamond Core Bits, | Drill Wine Bottles, Glass Block, Tile, Glass, Ceramics, Porcelain in the US | 100% 5 PK of 1/2" Diamond Core Drill Bits for Glass and Tile; Fits your drill or drill press 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