features and benefits witness mark™

  Witness Mark
Witness Mark™
The Oregon Witness Markā„¢ is a specialized feature created by Oregon and built into each cutter on Oregon professional saw chains. The Witness Mark™ feature enhances the life and value of an Oregon chain by helping chain saw users do four important things:
Witness Mark

1. Sharpen the chain at its optimum angle

2. Sharpen the chain accurately throughout its useful life

3. Keep the lengths of cutter top-plates equal

4. Know when the chain has reached the end of its life