Guitar Repair Kit with four specialty tools for common fret and nut work on stringed instruments. - Fret Crowning Files: Designed to handle the most common fret adjustments and repairs. Enables precise fret crowning to improve playability and extend fret life on guitars and other fretted instruments. - Ukulele Fret Files: Stable performance with high reliability. Simple and easy to use for quick, consistent fret work on ukuleles. - Bass Nut Files: A practical tool to slot the nut of acoustic guitar or electric guitar. Provides precise nut slots to support proper string height and setup. - Mandolin Nut File: A tool for repair and maintenance of guitar and other musical instruments. Useful for nut work and instrument upkeep. Use scenarios - Setup and fret maintenance: When a guitar or other fretboard instrument develops high or uneven frets, use the fret crowning files to address fret height for smooth action. - Nut slot adjustment: When string height or intonation is off, use the bass nut files to slot the nut on acoustic or electric guitars to restore proper setup. - Routine maintenance: Use the mandolin nut file for nut work and general maintenance on mandolins and other instruments to keep them in good playing condition.