Detailed Product Description Miniature Ball Bearing1.Metric Series, Bore Dia.: 1-12mm,68x,69x,MR8X,MR9X,MR6X2.Metric-Flange Series, Bore Dia:2-9mm, FXX ... .Inch Series, Bore Dia.1.984-9.525mm, Rx Series.4.Inch R-Flange Series, Bore Dia.1.984-9.525 FRXX series5.Miniature ... Bearings Thrust Series.F2-6------F10 ...