1.Brand:SKF,NSK,NTN,XRT(domestic) 2.Quality standard:ISO9001:2000 3. ... ,6211,621263series:6300,6301,6302,6303,6304,6305,6306,6307,6308,6309,6310,6311,631267series:670568series:686,687,688,689,6800 ... ,691016000series:16001,16002,16003,16005,160073)Sealing form:OPEN,RS,2RS,Z,ZZ,RZ,2RZ,N,NR4)Material:Gcr155)Quality standard ...