This one is perfect.
For fixing it is advisable to be in pairs, but because the part is quite difficult - which is an advantage in my opinion, since even a not very effective device to be attached to it.
Attachment with ordinary screws and dowels goes without saying, the supplied also go if you fill the hole in addition with some putty.
In my case, a 40 "Samsung LED TV hangs on it, which could be easily mounted using the supplied spacers.
When fully extended arm, the TV can almost completely to the left or right.
A drop in the bracket I could neither down nor to the left or right notice.
I can only recommend!