Wasn't real sure on where to post this, but if you're clearing trails or plots, this weedeater blade with chainsaw teeth is the best thing I've ever used for clearing brush and small trees up to about 4". It'll cut a 4" tree in about 10 seconds. The little saplings up to about 2" you can just swing the weedeater like your cutting grass and it goes right through them. Don't know yet how long these teeth will last or stay sharp, but I've put about 3 hours on this blade between last night and this morning, and it's still going strong. That's with cutting everything off just over ground level, so it's hit the ground every so often.
Amazon link
Amazon link