... years experience 3.competive price 4.excellent quality Thrust Needle Roller Bearings1. Material: Chrome Steel GCR15 / Stainless Steel / Carbon Steel ... ,WS,NTA, TRA,TRB,TRC,TRD,K811,K812, AXW series...) Roller and Cage assemblies ( K, KT, KBK, KZK, KZW series....) Heavy duty ... roller bearing ( NA, NK, NKI, NAV, KAO, HJ, BR, BRI series...) ...