Storm window clips

A quick learner from Atlanta GA says:
What's the difference between your 70-210 flush Clíp and 70-209 dimple Clíp? Size?

What screws do they take to go into metal? The depth of the frame with the screw is 1/4". Overall clip length is 5/8"

See what I need below in photo. Thanks
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Emily from SWISCO responded:

Hi there! The main difference between the 70-210 and 70-209 are the dimensions. You can also use our 70-112 to install the clip.

How to install a threaded rivnut for a wood window frame
How to install a threaded rivnut for a wood window frame
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