Q. What is the purpose of the arrow on the handle?

A. The E-File has two safe edges, one flat and one slightly radiused.  Since the radius is very slight, the arrow points to the radiused safe edge.

Q. What does the “r” mean on the file?

A. The E-File has two safe edges, one flat and one slightly radiused.  Since the radius is very slight, the “r” on the file indicates that side of the file is the radiused safe edge.