Originally posted by Braveheart Archery: I use a file on 'em, it works but they are far from the easiest single bevel to sharpen. They fly well and are Zwickey tough, and they do rotate in my broadheads targets like you'd expect a single bevel to do.I honestly think the best No Mercy is the double bevel 4 blade, and the double bevel 2 blade in that order.