You can buy drill bits made to drill glass. I have a set in the garage. I've tried diamond bits & even rat tail files in the past to drill holes in glass. They worked but not nearly as well as a bit made just for that purpose. They are fairly inexpensive as well.

Save a life, adopt a senior shelter pet.
The three main causes of blindness: Cataracts, Politics, Religion.
Name your dog Naked so you can walk Naked in the park.