... /carbon steelSKF BRAND Deep groove Ball Bearing 1).6000 Series:606,607,608,609,6000,6001,6002,6003,6004 --- Open, ZZ(Steel Shields ... ), 2RS, UG, 2RZ 2).6200 Series: 626,627,628,629 ... ,6205 --- Open, ZZ(Steel Shields), 2RS, UG, 2RZ 3).6300 Series: 6300,6301,6302 --- Open, ZZ(Steel Shields), 2RS, UG, 2RZ ...