What is the difference between 84-016 and 84-101?

A home owner from Charleston, Maine says:
I need to replace a broken screen door roller for a Kinro screen door.
Your company offers two rollers that appear to be very similar to my broken part.
84-016 provides all dimensions and sells for $#.##
84-101 does not provide any dimensions and sells for more at $#.##, a significant difference in price. What is the difference between these two? They look identical to me.
The diameter of the wheel on my part is 1 inch. All other dimensions are identical to your 84-101.
Will either of your replacement parts work in my situation?
Thanks for your assistance.
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Mike from SWISCO responded:
Good Morning,

The dimensions of the 84-016 and 84-101 are the same. The only difference between these two parts is the material of the housing. The 84-016 is steel and the 84-101 is stainless steel. If you live in a humid climate such as near an ocean you would want to use the 84-101 because the 84-016 could rust overtime from the high humidity.
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