This is a sliding door latch kit.

A quick learner from Warsaw, IN says:
the part numbers on it are 7700-17 and 2573562 and 7700-19, and 7700-16. all anderson windows
User submitted photos of patio door hardware.
Profile picture of Dave Sr.
Dave Sr. from SWISCO responded:
Take a look at our 82-037 latch and deadbolt assembly. I'm not sure if it's an exact match, but it could be a newer version of the one you show in your photo.
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