Now I have already been through wall bracket for my old JBL boxes and have to say that these holders were best here so far, taking into account the price for money. Surely you can at 17 euros for 2 wall bracket not expect overly much, but that's why I am very surprised by the holders. Installation was very easy. At first I thought that this screw holder will not be truly stable, but I was taught. The only flaw that let the holder is a little shaky, the. On the threaded rod, which is attached to the ball and carries the actual load