I needed to widen 4 7/1634; holes through 1/834; steel. The bit accomplished this, though I don't know if it would have done many more. They last hole took a little time, but it did what I need it to do, so that's worth four stars to me. I also used a drill press as I can't imagine doing this with a hand drill (I think that would be difficult with most any bit).
Rating:
[4 of 5 Stars!]