We can design and produce standard booms and arms， long reach booms and arms and high reach demolition . With advanced CAD system and various machining equipments and skilled experienced workers and practical knowledge application And with reasonable selection of materials and the thickness after analynsis of stress concentration part through FEM The products’ structure intension and using capability are guaranteed . The inside buffer plate is to support tensile load ,which prolongs the service life of excavators. We also can design various kinds of extension jibs according to customers’requirements . There are two kinds of extension jibs：two-segment type and three-segment type .Two-segment type is mainly applied in the transit of building materials like earth，sand，and concrete，the slope maintenance of expressways，and the dredging of watercourses，etc . Three-segment type is mainly applied in demolishing high-rise. Contact: Eric(Sales Manager) E-mail: Ericzhang@dg-jh.com