1,volve sprocket assy 2,stock:D31 D50 D60 D65 D4D D6D track roller and carrier roller 3,OEM available 1,Main products1,Description: track roller and carrier roller Process: forgingMaterials: 50MnTreatment: heat treatment HRC52-58Main Color: black or yellowCertification: ISO9001,ISO14001Defects liability period: 1440 hours 1,Description: sprocket and idler Process: castingMaterials: ...