Absolute garbage! Don't buy it! never had such a bad and DANGEROUS experience before. The cams are weak, weak, weak and the pre-drilled holes are awful, with sawdust falling everywhere. The screws barely had anything to grab onto. I used wood glue on all the dowels hoping it would help, it didn't. The back panels aren't held in by anything - they just sit in a little slot cut out of the fiberboard, not adding any additional support. It literally collapsed when I stood up the first tower.  I already got rid of the box, so not able to return it, but I am so mad at myself for taking a chance on this piece of trash.