Kewl, let me ask ya a question on those. I don't see much of a base to them, height and width wise so how does it stay standing straight up when you have a lake that has alot of current in it at times? I know I've put a 80 lb sac of quickcrete inside the holes of a 15 lb cinder block for my boo structures and checked them later on and they were on their side after we had a period of heavy current