When finished the bookshelf was beautiful. However, the tubes and screws that hold it together were poorly designed. It was easy to pull the threads out of the tubes. The tubes should have had a little thick wall thickness and better tapping of threads. Ended up replacing all screws with #12 close thread and retapping all rods. It would have been very expensive to hire a contractor to install. I was lucky I was able to re-engineer all the bolting. And, it took over six months to get. For what went into hanging it properly it should have cost half of what I paid for it ……...