Then you can adjust the hook to the required height by sliding it along the plastic tubing.
Finally, you hang your frame (or, in this case, skateboard) on the hook. The plastic tubing is quite long, so you can hide it behind by loosely securing it with a rubber band.
You can change the configuration at any time by sliding the hangers along the track or changing the height of the hook. This makes it very easy in our case to just add more skateboards to the wall!