I bought one of Jaspers's "KR" series Keyboard Racks and also bought one of these to attach another aluminum pipe to the side. It works exactly as you would expect: take it apart, slap it on the stand and tighten it up. It's quite solid.
Given the amount of effort required to reposition the reinforcement bars on my stand, which are attached with one-pieced fittings, I wonder why it didn't come with two-pieced fittings for that purpose. For that matter, I wonder why they even offer a one-pieced fitting at all.