Diamond coated bits,t hey do drill holes dremel just meant them to be used to engrave and ech glass. I have numerous different bits, but i found the ones that have a pointed tip work the best, just spray water and let the bit do the work (not too much pressure) and use the bit at a 45 degree angle, until you break throught the glass then you can use a different bit and work the bit vertical . I've drilled numerous holes with my dremel this way.
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