... .This design permits precision tolerance, even at high-speed operation. · Ball bearings available materials : Carbon, Chrome & Stainless Steel. Even Zirconium Oxide (Zirconia ... (Rod end bearing), oil bearing, wheel bearings.And the brands include NSK, SKF, IKO, KOYO, NACHI, TIMKEN, FYH, ASAHI, HRB, NTN,HCH ...