What are these threaded metal inserts in the side of my boat?

Jun 12, 2021
2
Jouet 18 Moreno Valley
New to sailboats so hopefully someone can tell me what these are. They are threaded and dont go all the way through. Maybe about an inch in. Something definitley screwed into them, but what??
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Jan 1, 2006
7,410
Slickcraft 26 Sailfish
I don't know but I don't think they are OEM. That gu,y the PO, prolly installed them judging by the sloppy sealant work.
 
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