Detailed Product Description Mini Bearing1.Metric Series, Bore Dia.: 1-12mm,68x,69x,MR8X,MR9X,MR6X2.Metric-Flange series, Bore ... :2-9mm, FXX,MFXX series.3.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 ...