1U vertical bracket for light rackmount equipment Uses 4 M4 screws (along with nuts and washers) to mount the brackets to a flat surface (in my case, the back of a TV stand) Depending on the print settings, it can hold a decent amount of weight (this one has no issue holding a 10 inch network switch, and could probably support 4 times as much weight). The two sides are separate, it can fit either 10 inch or 19 inch devices (or anything in between). The mounting holes are designed to accomodate rack cage nuts.