A set of (2) 3/4" + 5/8" specially selected for crafters and handyman drilling bottles, glass ,glass blocks ,title, grandit. etc. . These are very good diamond bits and hold up very well.
Included with your purchase are some additional tips & information that I wrote that you may find of interest.
Step-by-step instructions for Drilling Holes in Bottles
Tips for inserting DECO craft lights in your bottle