... /9001 4.warrranty:1500 working time Track Roller for hitachi,komatsu,caterpillar,daewoo,etc1.techonology:forging 2.Surface finishing:HRC52-58 ... HD1430 PC400-5/6 HD1880 Products: Track Roller for hitachi,komatsu,caterpillar,daewoo,etc Certification: