Why are the 75-016 roller different sizes?

A home owner from Minneapolis says:
Why do some roller screening tools have 2+ inch rollers and others have 1 inch, which
type makes do you recommend and why? Thanks,
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Dave Sr. from SWISCO responded:

Thank you for your patience. The 2" wheel is the convex type used for basic replacement of screen wire in a screen frame. The 1" concave wheel is used to install a wider screen spline or installing "glass" glazing vinyl. You may also use the 75-019 rolling tool which also includes both a convex and concave wheel.

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