These parts combined form a wind/rain and sun shield for sensors to be placed outside.
On the bottom you can use a cable gland (threaded M12*1.5) to secure wires leading to the inside.
You need at least a cover and a base ring. To get more space inside add any number of rings. If you need a mounting surface you can add a “TopRing” part.
The complete stack can be screwed together with M4 threaded rod or long M4 screws.
The screws tap into the 3 holes in the cover part. All other parts then slide on the M4 screws/rods.
The author marked this model as their own original creation.