Dave Sr. from SWISCO responded:
February 28, 2017
This corner key is meant to be used on Andersen window screens. If you don't have an Andersen window, I would not recommend using it. If you are not sure of the window screen manufacturer send us some photos of your current corner, along with dimensions. If you do have an Andersen screen, then you would need to deduct 3/8" of an inch on the width and height. The gap on the corner measures 3/16" of and inch.
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Dave Sr. from SWISCO responded:
March 1, 2017
This measurement is per corner.
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