... 20 days. 3.Material:Chrome Steel 4.OEM available StructureNeedle roller bearingSeriesK, NA, NKI, RNA, NK,etcCageChrome steel, carbon, stainless ... full needle and sealing types. Besides, the entity bushed needle roller bearings are divided into two kinds: that with inner ring ... inner ring so that its size is even smaller. Needle roller bearings without inner ring includes NK, NKS, RNA48, RNA49, ...