Seven 76 meter "U-shaped" main arms, with a standard balance weight of 31 tons and an optional 40 tons, can carry a maximum balance weight of 31 tons, saving users the cost of trailer transportation; Five axle high load-bearing truck crane chassis, three axle drive, three axle steering, strong power, and flexible maneuverability: Seven new design details for the overall appearance of the crane, shaping the high-end quality of the top crane.