... 2000 Certification Deep Groove Ball Bearing, thin section bearing 6700, 6800, 6900 series6900 series is the super thin extra light series ball bearings ... . Smaller but more ball complements still enable the bearing to withstand appropriate loading capability.6800 series ball bearings ... and lift performance.1. Features: Shield / closure: Open ball bearing, Z, ZZ, RS, 2RS, 2RZBall bearings snap ring: N ...