These are now hanging my pair of Genelec 8030s from a shelf on my desktop environment, taking the speakers up off the desktop & leaving room underneath that is better used.
They are very well engineered and once tightened up, very solid. You can tilt and swivel a little but be warned unless you want to resolder/rewire you'll have to use cable ties to tidy your cables rather than use the hollow interior to run the cables.