Excavator and Bulldozer track roller,bottom roller,lower roller Material:50Mn Hardness:HRC52-HRC58,depth:5-8mm Xiamen EBpart Manufacturing Co.,Ltd produce high performance and reliability track rollers used for crawler type heavy equipments,such as excavators,dozers,applicable for caterpillar,komatsu,hitachi,daewoo,kobelco,sumitomo,hyundai,samsung,volvo,mitubishi.( All manufacturer's names, ...