This filament spool holder is designed to be mounted/supported on a wall-mounted "Louvered Panel" such as those that support Akro-Mils bins. Examples of these panels may be found here: https://akro-mils.com/Products/Types/Cabinets-Racks-Shelving-Panels/Louvered-Systems.

The holder requires a short length of 1" schedule 40 PVC pipe to function as the axle.