I'm not sure - but I'd look next to the CAPS LOCK Key ....
I have not seen the glass bits @ a lowes or home depot. I'd look @ speciality hardware/tool shops in the yellow pages.
Good Luck!
smooth, I had my 125 gal drilled at a local glass shop for $20bucks, but had to sign a waiver in case glass broke(glass was non-tempered too), but didn't break and they had it done in about 5 mins.