Expansion Hooks

The bolt, the expansion pipe, the mounting parts and the fixing body are tightened into one. Expansion screw consists of a cylinder with incomplete cracks, which is sleeved in a screw head into the single-ended nut of enlarged cone, and the bolt is screwed on at the same time as the bolt is screwed on by the conical nut head, and the cylinder sleeve is opened to further compress the hole wall and increase the static friction