1/8" Diamond Core Bits (Bag of 3) for glass and tile. Free instruction guide for beginners. Drill glass, tile and porcelain. These bits fit almost any hand drill or drill press. 100% money back guarantee. You'll drill glass and tile without special tools. Perfect for drilling wine bottles and glass block. Simple, Easy to Use, Beginner's drilling instructions show you how. So simple that anyone can do. All you need is your drill, the diamond drill bits and a kitchen scrubbing sponge. Water from the sponge keeps the bit wet and cool. Your glass and tile projects will be a success. Your diamond core bits will drill holes glass quickly and without breaking any bottles or glass. Use your regular hand held drill or drill press. It's an easy decision. You'll be glad you did.