Well ... 71

I bought my boxes each 3.7kg hang these holders stable over the desk.
Even during the installation I had to improvise in order to guarantee a secure hold, because the screws by far not sufficient to bear the load.
For me, however, no reason to complain about.

Only when I woke up in the middle of the night - by a loud bang - and noticed that a speaker from nearly one meter had fallen on the floor, I was somewhat taken aback.
I dug out the manual and lo and behold, instead of the payload of 5 kg described here was there that the holders may be charged only to 3,5kg. Great.

So that the product had become useless ...

So if you shop around for a couple stable holders, should skip this offer ...