... row tapered roller bearing ,deep groove ball bearing,cylindrical roller bearing,automobile tensioner bearing and bearing wheel kits).Please check our informations ... )2)Material:Gcr15(Chrome steel)--China3)Shield/Closure of deep groove bearing:Plain(Open),Z,ZZ,RS,2RS4)Vibration and Noisy ... level of deep groove bearing :Z1,Z2,Z3,ZV1,ZV2,ZV3Z1V1,Z2V2,Z3V35)Precision ...