Spacer for 16mm rod for mount with with M5 metric nut

This is a spacer for all kind of 16mm rods or tubes. This pacer is designed for tensile strength to be mounted at a wooden ceiling with with a M5 metric nut inside. The space for the nut is designed very tight in the spacer. I recommend a screw to pull the nut in. Look at the first picture.

I'll use several beech rods to build a drying cabinet. To give you an idea what I mean I add some pictures to this design page. 

For the hook I recommend: https://www.printables.com/de/model/333184-a-very-specific-s-shaped-hook because this hooks have an opening of ~11mm. This prevent for losing the hook from the rod when I remove the meat from the hook.