Files

For saw sharpening. To choose the right file, size it to the tooth. Ideally, about half of the cutting surface of the file will be in contact with the tooth -- half of the file will be in the gullet and the other half unused. When you rotate the file to get a fresh edge, it will be uniformly sharp. If you use a smaller file, only some of the new surface will be fresh and the rest dull. The chart below is a good guide. Made by Grobet in Switzerland. Always use a handle on a file.

Saw File Chart