Amazon: Guitar Fret Crowning File
Baroque Fret Crowning Files Diamond, Guitar Fret Crown Dressing File, Fret Repairing Tools, Luthier Tools, Improved 3rd Generation, with 3 Sizes for Guitars, Ukuleles, Bass, Banjo, Mandolin. ... 2Pcs Grinding Stones, Fret Crowning File, Fret Leveling Sanding Beam, Fingerboard Guards and Wiping Cloth for Guitar Bass. 4.1 out of 5 stars 24.