As soon as I'm far from my workshop and I needed to make a couple of holes bigger in diameter, I have just bought the drill bit, heated it with a lighter and pushed it into a slightly smaller hole in a 3d printed handle. Worked well for my case thus it is all wrong and the drill bits shouldn't be used like that.
If you need such a thing for your purposes - I can change the diameter and upload more options, just ping me.

The current diameter is 1.8mm