The size of the U-shaped ring embedded in the cantilever frame is called the U-shaped fixing bolt or U-shaped screw of the cantilever frame, the model is U 1002, and the specification is: 370 mm *120 mm; The U-shaped ring embedded in the cantilever frame is mainly used to fix the cantilever frame of the unloading platform. It is made of 18mm round steel, with a length of 370mm, a width of 120mm, a length and width of 220*60mm* 10mm respectively, four nuts and two galvanized gaskets.