... bore size. 4. Features: Shield / closure: Open ball bearing, Z, ZZ, RS, 2RS, 2RZBall bearings snap ring ... level: V4, V3, V2, V1Radial play: C0, C2, C3, C4Material: AISI52100, AISI440C, AISI304, AISI316Retainer: PTFE, nylon, ... two side metal shields Z and ZZ (2Z)With a snap ring groove in outer ring ... 6302, 6303, 6304, 6305, 6306, 6307, 6308, 6309, 6310, 6311, 6312, 6313, 6314, 6315, 6316, 6317, 6318, ...