Made in Japan by a company that has been manufacturing files for 80 years and guitar files for three decades, these are the best on the market for sharpness, regularity of cut, and durability.
Used to remove the burr left from bevelling fret ends, this file has extremely fine, sharp teeth. It is double sided with no teeth on the narrow edges.
One edge is flat to work into square corners, and the other is rounded to let you roll the file as you shape the fret end without marring the fretboard.
Measures 6" overall with 1/8" wide by 3 1/4" long cutting faces.