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Paul from SWISCO responded:
November 28, 2017
Great question. The housings are actually the same. Our 23-199 bottom mirror roller is for lighter weight doors where as our 23-225 roller assembly has ball bearing wheels for heavier doors. In my years of experience, I have known many people prefer our 23-225 for the smooth ball bearing ride of the doors. I hope this has answered your question.
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