Twice I've bought these and twice all had cages interfering with the races to prevent friction free running. I still use them to repair low rpm medical equipment but I'm surprised Quality control at the factory cant see they have a substantial amount of friction! Excellent value otherwise, will continue to use.
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excellent product for model railroading
February 19, 2012
Reviewer:
Bernd from Rochester New York
Very useful in model railroading drive units. Cuts down on friction. Better than friction berings.
Not smooth running, but price is right 
excellent product for model railroading 
