Good idea at low price, but produced by someone who really didn't care. The vertical posts are 36" long, so to get 72" one of them stacks on top of another. To stack straight and stable, they should have 90-degree cuts, but mine are cut at any random angle.  When I stack them they naturally sit at awkward angles. Such a shame, because it would have been so simple (and no additional work) to cut them properly. I gave two stars because the potential is there. Also four were damaged in shipping, but that is a separate issue.