... ect... Model specifications Boundary Dimenssion (mm)Mass (g)Bearing NumbersBasic Load Ratings(N)Limited Speed(rpm)dDBB1rminapproxOpenSheildedCrCorGreaseOil362.02. ... TIANHEModel: 603zz,604zz,605zz,606zz,607zz,608zz,609zzQuality Standard:ISO9001:2000 StandardFeatures:1)Tolerance : ABEC-1,ABEC-3,ABEC-5, ... .Poducts ShowPackage Show 623 plastic miniature ball bearing/china/good quality/best price