Choosing your cup bur in this manner, you will find that one will fit several wire gauges. Our sister site, Jewelrytools.com!
, has a great selection of cup burs, including some sets! Remember that these are very versatile as they can be used in either a hand holder or in your Dremel or automatic wire twister.
For those of you who may not know what a cup bur is or how to use it, Denise Peck
has a great video on our wire rounder (that includes a cup bur) and how to use it.
Answer contributed by Dale "Cougar" Armstrong