Knock on wood, I haven't broken one yet but I've only drilled about 15 holes, but it's always a possibility. The key is not to get in a hurry, let only the weight of the drill push against the glass. I have always used just a battery powered hand drill and it's worked well, I drilled 7 holes in my 240 with it and that was 3/4" glass. As for sizes I have a set starting at 1/2" - 2 1/2". :bum:
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