Purpose of a screen hanger

A quick learner says:
I am trying to mount my screens to the outside of the windows. most of the windows have an aluminum "U" shape form on the sides and the screens slide down the U and are held in place. Will the 70-158 perform the same function?
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Dave Sr. from SWISCO responded:
The 70-158 screen hanger was used by General Bronze for their aluminum windows. I do not know if you would be able to adapt this screen hanger to your application. I suggest using the 70-056 with a pull ring. This works very well with screws on the outside of wood windows.
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