... of friction, high limiting speed, large size range and varations of structure, they are suitable for precision ... speedBBCSealed grease lubrication CBADustproofCBAWaterproofDCBA.ExcelientB.Good C.Fair D.Poor Series:SeriesBore diameterVariant structure600010~120Z,2Z,RZ ... which single or double shield, seal ring, and outer ring with snap ring groove, snap ring. Deep groove ball bearing 6016~6024 ...