One flat file, works on fret edge and fret end round. You will experience the amazing efficiency of diamond. Diamond abrasive way to coarse for this application, use fret erasers makes the frets as smooth as buttery.
Universal Guitar Fret Crowning File Fretboard Leveling Dressing Tool (a10
Baroque Guitar Fret Crowning File Fret Repairing Tools With 4 Size Edges IWWP
Baroque Guitar Fret Crowning File Fret Repairing Tools With 4 Size Edges UHBR
Guitar Fret Crowning File DIamond & Oak Handle Tool. Chris Alsop Guitar UK TF085
Guitar Fret Crowning File. 2.5mm concave profile diamond file. UK MADE TF080