Many people have tried using round files to sharpen with poor results. Professionals will tell you it takes years of practice to sharpen correctly and even then human error eventually requires the chain to be sharpened on a machine.

Chains sharpened on a grinder can remove too much material killing the lifespan. Grinders can also heat teeth to the point where the tempering is removed. This will cause chains to dull again quickly.

The Timberline Sharpener guarantees accurate and precise angles on every tooth. User error is virtually eliminated as a solid platform guides the carbide cutter into each tooth.