As this is the first time I buy this kind of thing, I had a fear of the strength (or rather the non-robustness) of the product and the possibility that fixing abyss my office. How wrong I was! This product is very robust and the mounting system ... ah, if they could all be as well! The arm with the on-screen is not-perhaps more stable and part of the attachment that comes in the office is a large very well finished metal plate that absolutely no risk of damaging the surface against which it will come be pressed. Moreover, the sending and receiving were very fast, thank you to the seller.