A rounded fret top is best achieved by using a rounded file ! Narrow 1.5mm Fret Crowning Tool with DIAMOND CONCAVE file. This is a diamond fret crowning file. A diamond file with a concave profile is mounted in shaped handle made of Oak hardwood.
Nickel Silver Narrow Tall Guitar Fret Wire - 2.4mm x 1.3mm
2 File DIAMOND Fret Crowning File System. 2.0 & 2.5mm wide TF088_2025
Explorer Style DIY Electric Guitar Unfinished Mahogany Body Diamond Fret Inl
3 Files DIAMOND Fret Crowning File System. 2.0 & 2.5 & 3.0mm wide TF088_202530