7/16corner OPENING OF ENTRANCE OF FRAME 1/2"×1/4 ... THICH STOM WINDOW SCREEN FRAME
A handy person from Aurora IL says:
November 29, 2020
7 /16 corner
Bob from SWISCO responded:
December 2, 2020
We don't have an exact match for this corner key, but start by considering our 95-229 or maybe our 95-052. Look over their dimensions and let me know if you think one of these replacements could work for you.