Quote Originally Posted by McCreed View Post
That's not correct. If they are proper nut files they will have a rounded cutting edge.
Not really. My Hosco files have a flat bottom to then, though the very edged are rounded over with a small radius (just checked with my new digital microscope). The thinner the file, the more they approach a rounded section as there is less flat section in between the rounded ends, but they never get to a full semi-circular profile.