Re: New (To us) P30 :)
Welcome to Sailnet!
You must be the couple that BLJ mentioned.
That appears to be a clamp / mount for the pedestal guard. It is probably for a table. There should be a stainless steel nut & bolt that tie the two halves together, and there is a mount that slips into the holes that run parallel to the large holes.
They look pretty damaged by UV. I'd toss them.
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USCG Licensed OUPV Captain, ASA 101/103/104/105 Certified Instructor - Also certified in Recreational Marine Electrical Systems