I lost a big locust tree (hardest North American wood), more than two feet in diameter and 30 feet tall, in my yard, and rather than fooling with my old chain, I ordered a new one for the job. I was pleasantly surprised. Locust is really hard to work with, but I was able to cut it into manageable lengths easily. The chain was dulled, of course, but it's still usable and I'll finish the job before I sharpen it.