I have a corner shelf which hangs off of a wooden hanger on 2 sides. The wooden pieces are put up and then the shelf slides over them and screws into them to keep them in place.
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We used this to sit a tv on in the corner of the room so it didn't take up floor space. It will hold quite a large tv.
The shelf measures 17" from the furthest corner to the front of the shelf. The shelf is 24" wide and 3" high.
Excellent condition. Walnut colored shelving.