It's the lower left and right pivot for a wooden window. It's made from steel.

A handy person from Massachusetts says:
November 9, 2019
I am looking for replacement parts for the window pivot.
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Paul from SWISCO responded:
November 12, 2019

Thanks for posting on our discussion board. Could our 20-016 tilt pin be a good replacement for your part? Look over our measurements and let us know what you think.
Tilt Pin
Tilt Pin
20-016
$0.90
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