... -SKF,NTN,NSK 3.Rapid quotation and delivery Deep groove ball bearing: Detailed Description:1) Model: Open, Z, ZZ, RZ,2RZ ... level: reach the same level as the Japanese and European bearings 3) Tolerance level: ABEC-1 (P0), ABEC-3 (P6),ABEC ... .320.288 High quality 6000,6200,6300 series Deep groove ball bearings