This is a very poorly designed adapter. I wouldn't trust any of my monitors with this unless I was about to fall and destroy them. There must be some sort of physical fastener connecting the two pieces together, but they don't even provide it. It was very frustrating to use and I decided to return it as it is just unusable in the current design. I tried using this on a 23 inch monitor so well within the size limits that they again stated it was very impractical and not user friendly at all.