What is this called

A quick learner from Calgary says:
May 19, 2021
What is this piece called and how do I get more, and install them?
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Casey from SWISCO responded:
May 21, 2021

Hello,

Take a look and compare the specifications of the 70-218 Pella knife latch to yours. Thanks for posting! 
Pella Knife Latch, Non-handed
Pella Knife Latch, Non-handed
70-218
$0.92
How to remove screen knife latches
How to remove screen knife latches
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