miter cut for this corner

A contractor from Maryland says:
how much allowance should be taken from the cut for this type of corner. 1/4 of an inch?
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Dave Sr. from SWISCO responded:
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.
A contractor from Maryland says:
Is this measurement total for both corners or per corner.
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Dave Sr. from SWISCO responded:
This measurement is per corner.
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