New R&D sealing components More Precision of surface treatment with ball raceway More smoothly while lower noise 6021 ZZ/6021 2RS/6021 DDU/6021 VVDimension:d:105mmD:160mmT:26mmWeight:1.59 kg1.Material : Gcr15(Chrome steel)--China,(AISI)52100---American ,(Din) 100Cr6---Germany 2.Precision level:ABEC-1,ABEC-3,ABEC-5 P0/ P6 /P5/ P43.Fields Used in : Motorcycle , Motor , Pump ,Fan,Air conditioner , ...