The product is mainly used for pipeline support, hanging, bracket or equipment fixing. Its working principle is through the cone design of the end of the bolt, when the nut is tightened, the bolt pushes the cone part to move outward, thus generating significant positive pressure on the peripheral surface of the expansion pipe. Due to the small angle of the cone, this design allows for a frictional self-locking between the wall, expansion tube and cone, resulting in a solid fixing effect.