Deep groove ball bearing: Suitable for precision instruments, low noise motors, automobiles, motorcycles ... range and varations of structure, they are suitable for precision instruments, low noise motors, automobiles, motorcycles, and ... torqueBBCHigh speedBBCSealed grease lubrication CBADustproofCBAWaterproofDCBA.ExcelientB.Good C.Fair D.Poor Series:SeriesBore diameterVariant structure600010~120Z,2Z,RZ, ...