mirror door rollers

A handy person from Suisun City, CA says:
I need to order the bottom track # 23-243. The two types of rollers you show are similar to the ones i have on the doors now. What is the difference between roller #23-199 and
#23-225 as they both show the same measurements, and look the same.
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Paul from SWISCO responded:
Thanks for posting! Good question. Our 23-199 has a standard convex nylon roller, while our 23-225 has nylon ball bearing convex roller.
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