I'm rebuilding a 2nd floor deck. It has three 4x6 posts that are set 2' into a concrete pier. They were all rotted and the deck was leaning. We jacked it up and pulled out the rotted posts. The problem is that there was still a lot of the post left in the pier. After many hours of chipping and chopping with a pinch bar and crow bar I decided to give this a shot. I took a chain that had very little life left in it and began plunging. I was able to chew up the wood and clean it out. Yes the blade had no more life in it but it worked well.