Very handy way of expanding CD/DVD storage space when you don't want to get (or don't have space for) more shelving units. Ended up buying two to place atop an existing shelving unit. There are two larger spaces at the base that can fit multi-CD box sets. The spaces above are slightly wider than a regular CD case. One slightly weird thing is that both that I ordered came with only two screws/plugs even though there are four holes for wall mounting (at the top and the base).