I had David make me one last year, first one on a Nils, as he put it.
It works good, a bit tight of a fit, need a hammer and screw driver to knock it back off, at first, but it's getting easier to take on & off.
I used it with an 18v lithium Ion drill, I would get around 4-6 holes in ice around 13"-15". I had my drill start to smoke on me, so I stopped using it at the time, this is with an 8" Nils auger.
I upgraded to a 36v Bosch Li Ion this year, have yet to try it, but I think it's going to do just fine, seeing as how the 18v did pretty good last year.