The "Fret Thingie" by Ken Parker.
Ken Parker has been using the Fret Thingie for many years to help with the final touches of fretwork. This tool has the correct shape to match the top of your frets to remove fret file or machine marks.
Here is what Ken has to say...
"I have made many versions of the tool over the last 40+ years, and this design seems the best. The tough polycarbonate will hang in there and give good service, and the textured surface makes it easy to hold without a death grip.”