Exact compatibility: Effectively repairs uneven fret crowns, smooths fret edges, preserves acoustic guitar compatibility, and ensures precise bass intonation. Guitarist gift: A luthier tool and a top choice for musicians and bassists for precision fretwork. Delivers optimal playability and tonal accuracy, a thoughtful gift for instrument enthusiasts. Smooth performance: Multi-face grinding provides a smooth playing feel by effectively removing burrs and oxidation. Stable intonation and metallic shine are easily restored. Precision: Millimeter-accurate tool made from durable, gentle materials for consistent grinding, precise adjustments, careful edge work, and high dimensional stability during fret wire leveling. Use scenarios - Repair uneven fret crowns on a guitar to restore even playability and accurate action. - During refrets or fret leveling on acoustic, electric guitars and basses to achieve precise frets and consistent intonation. - Routine maintenance to remove burrs and oxidation from frets, improving feel and tone.