These are only about 2.5 inches wide, which limits plane iron size, but they got 4 plus stars on 357 ratings, so they are probably OK for smaller blades. I would add some 2,000 and 4,000 grit sandpaper, and a leather strop to really finish the job. I went to a glass shop and they gave me a chunk of half inch plate glass, which I use under the sandpaper. Nice and flt, and the guy in the shop even beveled the sharp edges for me. If you can shave the hair on your arm, it's probably sharp enough to work well. But the finishing, removing the burr, makes a real difference in performance and ease of use.