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Michael Gurian designed these fret files to be used for most sizes of fretwire. The burr holder is designed to file frets over the face of an instrument without worry of damage, and, with some restraint the file can be used with the strings on. The burrs are held in the burr holder with a cap screw and can be quickly replaced. There are three different size burrs for small, medium and large fretwire, covering all fret rounding requirements. The 3-in-1 Fret File set, (FFRG) comes complete with handle and all three burrs. Replacement burrs are also available.