... ZWD Needle Roller Bearings and Cage AssembliesIt is a kind of independent bearing unit with high load capacity and rigidty especially applicable ... for the tray of shaft and seat holes with the unit ... Roller: KR, KR PP, KRV, KRV PP, NUKR SeriesThrust Roller and Cage Assemblies: AXK, AXW, K811, K812, K893, K874, K894, ...