These are hooks for wall-mount network server cabinets. They can be used on any double-walled cabinet, 2.2 or 2.3mm thick. In my case, I have a Navepoint cabinet that's on wheels and use them on the outside of the cabinet to hold additional cable length outside of the cabinet. If you wall mount your cabinet, they can be used on the inside as well as on any unused mounting hole.

The hooks have additional support against the cabinets compared to other designs. They are available in 50mm, 75mm, and 100mm lengths. I have included the step files if you want to customize it to you specific sizing needs.