1.Mini Excavator lower roller PC20-3 2.Material:50Mn 3.Hardness:HRC52-55 ... .Warranty:6 months 5.Process:forging 1.Product:Mini Excavator lower roller PC20-3 2.Warrenty:6 months3.Track toller effect ... ,Segment,Idler,Track Link Assy,Track shoes, Bolt & nuts,Track bush & pin,bucket,bucket teeth,Adapters,Cutting edge and end bit ...