An improved file for dressing the ends of the frets, after they've been installed, trimmed flush and beveled. With one thin edge ground "safe," and the other rounded over, this file cuts only where it needs to: on both sharp corners of the unground thin edge, and on both of the wider toothed cutting surfaces. 

Works on stainless frets, too!
All of our tools are suitable for use on stainless-steel fretwire, with the exception of our Fret Tang Nippers and Fret Cutters. Modern stainless-steel fretwire is known to be harder than the traditional nickel-silver blends, but our own shop experience indicates the wire does not cause premature wear of files or sandpapers.