This is a 1U Rackmount Under Table Bracket designed to mount a 1U 19" DBX 286s on the side of a bookshelf. It can also be mounted under the table, but may become an obstacle depending on the height of the table. There are two versions included in the package. The V1 version leaves a 6mm gap between the mounting surface and the 1U unit for better airflow. The V2 version leaves no gap, allowing the 1U unit to sit flush against the table / surface you are mounting to. The product requires four M4.16mm machine screws with nuts and washers to attach the 1U unit to the bracket, and four standard wood screws to attach to the table / surface.