Ideal for professional guitarists, instrument repair technicians, and luthiers who work on guitars, basses, pianos, ukuleles or banjos and require precise fret dressing and crowning. The 3-in-1 fret file features adjustable angles of 3/23/35 for precise removal of fret burrs and shaping of fret crowns, offering multi-angle versatility for professional maintenance. This wood-made luthier tool provides efficient material removal while maintaining the structural integrity of the fretboard during repair or guitar building projects. Suitable for home workshops or music repair shops, it smooths fret ends with textured protective paper to guard fingerboards from accidental damage. Use scenarios: - Refretting or crowning frets on a guitar (or bass) neck to restore playability and eliminate burrs. - Dressing frets during fretboard repairs on ukuleles or banjos, ensuring accurate fret shapes without compromising the fretboard. - Building or rebuilding guitars in a workshop, where precise material removal and multi-angle fret work are needed for final setup and finish.