... frequency heat treating equipment guarantees maximum strength. Maximum lifeEach roller shell is carefully heat treated to ensure long wear ... life and stress resistance. Precision careEach roller is precision machined to house special high impact low ... wear bimetal bushings.Replacement parts of track roller for Caterpillar,Komatsu,Hitachi,Kobelco,Mitsubishi,Sumitomo,Daewoo,Hyundai ...