I am selling this because I no longer use it. It comes with screws for attaching to the tabletop. There is no outer box or instruction manual. FLEXISPOT PC Case Stand CH1 Under Desk PC Storage Box PC Wagon Wall-Mounted CPU Cooling Rotatable Holds up to 15kg Black (Black) About this product: Space-saving: You can make good use of the space under your desk. Compatibility: This type can expand up, down, left, and right, and supports PC cases of various sizes. Rotation function: You can rotate the holder to easily manage or replace the cables on the back. This product is especially perfect for our standing desks. When the desk rises, the computer cables may become too short. In this case, the problem is solved if the computer itself rises and lowers with the desk. *Limited to wooden desks with a tabletop thickness of 20mm or more. Note: When attaching to the tabletop, please check the material and load capacity of the tabletop.