... .Easy maintenance 3.Mini, small, medium,large 4.OEM Cylindrical roller bearings: Features:1,Structure: General,flanged,extended inner ring2,Shield ... , C4, C56,Material: AISI52100, AISI440C, AISI304, AISI316, Ceramic7,Retainer: PTFE, Nylon, PEEK Or Stainless Steel Model No.1) N202 - N248, N303 ...