For smaller holes for wire or hooks in glass jewelry, you will need to use the Triple ripple drills.
These small drills come in several sizes and in packs of 6, 25, and 100.
Being a smaller drill, they will not last as long as a larger drill. If you are consistently drilling holes in your pieces then we strongly recommend using the 25 or 100 pack. For occasional drilling, the pack of 6 drills will last quite a while.
Make sure you know the mm sizing of your wire before ordering. A handy reference can be located here for transferring wire gauge measurements to mm.