Diamond Core Bit Set for Dremel Tools for Glass and Tile | Beginner's Instructions Drilling Guide | Idea Guide | DCBSet FREE Beginners Drilling Instructions. Easy to use. Fits your Dremel Tool FREE shipping in the US. No risk - 100% Money Back Guarantee This set contains 6 new diamond core bits for your drill, drill press or Dremel tool EASY - Use your kitchen scrubbing sponge to hold bit and cool the glass. Its all in your Beginners Drilling Instructions. 1/8" to 1/2" and 4 sizes in between. 14 years of experience helping customers (like you) drill glass, tile, concrete and stone. We've helped more than 100,800 satisfied customers. We can help you too.