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a. Our factory supply OEM Quality track roller for Kobelco CK850G crawler crane. It's one kind forging track roller. b. The main technology process is heat treated. c. We also manufacture other undercarriage parts and OEM parts. Best seling models of Kobelco series: KObelco ck1000ii Track Shoe, Kobelco ck1100g Crawler Crane Track Shoe and so on.