What are these?

They are only on the port side.

Looking around to see if I can find male posts that I can use to mount table, etc...

-Thomas
 
They look like simple 7/8 or 1in tube slots and might accept anything attached to some stainless tubing. Likely used for a boarding ladder or steps on the inside of the boat of a custom table or line hauler. Used them to add what you need.

I would at least used them for a table or a couple of steps that could work inside or outside the cockpit.
 
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