Witness Mark™
The Oregon Witness Mark™ 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:
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
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