Mr.Power Guitar Banjo Mandolin Fret Wire Sanding Set This nice tool is useful for luthiers, Guitar , and DIY for many fret works. You can use it for thin and fat frets .Made of Stainless Steel is very hard and flexible. Fret removal -protects the fretboard when using fret pullers. Fret crowning -protects from the fret file when we are rounding the frets. Fret polishing -Give us a nice smooth feel use a steel wool ooo or a fine grade.