I used this to mark and rule out movement above the surface waterline. The price was decent. In general, the barricade is of poor quality. It was relatively easy to install, but the center bars are too weak and eventually fell off. I threaded the rope through the ends at the top to keep it from falling all the way off, but the middle is still arched and sagging. Also, the reflective stickers started falling off immediately. This will work for what I need it for, but it's very cheap and poor quality.