screen knife latches

A home owner from Leeds Maine says:
screen latch for my Pella screen. the markings are Pat RF 24.520
Thumbnail of the uploaded file named Screen latch.jpg
A home owner from Leeds Maine says:
the measurements are 1" across the top and 1 1/8 from bottom point to lower part of circle
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Tom from SWISCO responded:

We don't sell this exact knife latch, but our 70-143P is similar. This also happens to be made specifically for Pella screens. Look over our dimensions and let me know if you think this would work for you. 

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Alternate image for 70-143P

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