good choice. I started with a 3/4" and it did A LOT. But I was getting inconsistent finger notches trying to wallow out the notch so I get a 1" which has been a huge help. 60 knives in, I've just now gotten into a spot where I need a really small wheel to avoid changing the geometry of the knife to match the wheels I have (which is not a big deal if I did that, but it's still a seat-of-the-pants type fix, and I doubt I could ever do it the same way twice.) For this very infrequent issue, a steel wheel (a bolt-body, basically) would be just fine.