1.Materail:50Mn steel roller 2.Hardness:HRC50-56\5mm-10mm 3.Weight:46.6kg 4.Tec.:Forge 5.Certificate:ISO9001,ISO14001,BV D50 Komatsu Bulldozer Track Roller1.The company mainly produces all kinds of excavator and bulldozer undercarriage parts,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, ...