tandem patio door rollers

A quick learner from Malibu says:
What are the differences among 81-051, 81-052, 81-163 (besides brass vs. stainless)?
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Tom from SWISCO responded:
The 81-051 and 81-163 are the same size, and the only difference is that the 81-163 is stianless steel. However the 81-052 has a different height and width than either of them. You should carefully compare each of our dimensions to your own measurements to confirm which is best.
A professional from California says:
You might want to mention the flange on the 81-051 and 81-052 that is not on 81-163.
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