This shelf is designed to be mounted on top of your TV/monitor and will accommodate lighter items. I use this to mount a video bar that weighs about 7 pounds. It's made entirely of plastic. The legs, which rest on the back of the TV, are angle adjustable with a thumbscrew to tighten them so they don't move. The shelf has two small holes for cables to pass through, as well as a small ledge around the parts of the shelf. The shelf was easy to set up, but even after installation, it felt a little flimsy when you pressed it down - it's definitely not designed to support a lot of weight. I put a video bar on it and it seems pretty sturdy - it stays in place and the shelf doesn't flex. Although there are a few things I would like to see - metal instead of plastic and maybe some rubber/silicone. along the bottom of the shelf where it touches the top of the TV and on the legs - given the relatively low price and the fact that it works I give it 4 stars.
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