dimensions clarification

A home owner from Portland, OR says:
Please clarify how the 1 5/8 dimension is measured. Is it from the underside of screw hole to the underside of the bracket (where it presses on the screen)? Or is it measured from the top of the screw hole to the underside of the bracket? Or something else? Hard to tell from the diagram. The devil's in the details :-) Thanks.
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Casey from SWISCO responded:

Hello,

We'd be happy to clarify the measurement you're unclear about to but it sounds like you are referring to a specific part from our website. If so, we will need to know the product code to look into this for you. Thank you. 

A home owner from Portland, OR says:
Thanks for your quick reply. I clicked on the "Ask a New Question" button on the product page, so assumed the part would be referenced. The product I'm asking about is:

https://www.swisco.com/Z-Clip-1-5-8/pd/Insert-Panel-Replacement-Metal-Clips/70-057

Thanks!
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Casey from SWISCO responded:

Thank you for clarifying. The 1-5/8" dimension shown below is the overall length of the z-clip between the outer portion of both ends.

Alternate image for 70-057
Alternate image for 70-057

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