ITEM NAME:Guitar Fret Crowning File Leveling Tool Grinding Protectors DIY Repair Part C3S1 Guitar Fret Crowning File Leveling Tool Grinding Protectors DIY Repair Part C3S1 The file is used for narrow fret crowning after leveling. With ergonomic handle for comfortable holding. The leveling tool with accurate straight edges helps you to detect any discrepancy existing in frets height. Fret protector shims for protecting your guitar or bass fretboard from scratching or damaging while filing and polishing. Mainly adopting stainless steel, anti-rust and durable. Pretty useful for luthiers, guitarists, and many DIY fret works.