... Certificate:ISO9001,ISO14001 2.Materail:50Mn steel roller 3.Hardness:HRC50-56\5mm-10mm 4. ... 5.Delivery:7-15days EX200-2 Excavator Track roller 1.The company mainly produces all kinds of ... ,such as Track Roller, Carrier Roller, Sprocket ,Segmnet, Front Idler, Track Link assembly,Track Shoes,Track Bolt and ... Nuts,Track Bush and Pin,Bucket Pin,Roller Guide,Idler Yoke ...