Considering the price of 13.75 I did not expect too much, because you already have to spend elsewhere partly for Speaker holder of this money. These are simple plastic parts which are painted silver, the coating is not very well applied. As the holder but anyway largely disappear behind the pits, it is not so important. The enclosed mounting material is very inferior. I have resorted here at reasonable screws and dowels. Overall, the holders fulfill its purpose, namely to keep the boxes in place.
Caution: The adjustment for the ball joint located on top of the joint. Whoever secures the boxes on the wall near the ceiling, the screws can be difficult or impossible to attract.
Overall, for the money an absolutely recommendable product.