Do you also have too have an amazon desk with lovely bracing along the sides, if so these are the hooks for you.

The wheel sits nicely into the nook of the hook and doesn't allow for any movement, this combined with the snug fit of the squared off part of the hook means even if you're moving your desk around these can be left in situ without having to worry about damaging anything.

With an internal width of 17mm for the top square part of the hook these slide perfectly over the bars commonly used in flatpack desks. 

The internal diameter of the hook is 35mm so plenty big for a full size wheel to be placed into.