... have chrome steel, carbon steel Deep groove ball bearing CharacteristicsVariant Structure2Z2RZ2RS1Low friction torqueGoodGoodFairHigh speedGoodGoodFairSealed grese lubrictionFairGoodExcellentDustproofFairGoodExcellentWaterproofPoorFairgood ... ,ZN,RZN6300200~1200Z,2Z,RZ,2RZ,RS,2RS,N,RN,ZN,RZN640010~100N,NR6400110~1200N ... ~1000Z,2Z,RZMini bearings1~10Z,2Z,RS,2RS,F60000 We have large stock for 608zz ...