Hookah hose hook on rail

Diameter of top hole is 17.5mm, bottom 17.5mm too. Bottom hole at 30°, you need to print two mirrored instances.

FreeCAD source is included, but modification can be tricky. There is 3 sketches, if you want to modify size, you will need to correct them on all three sketches, I discovered feature of expressions to specify sizes from other sketch too late :).