Description:
Applications: Widely applied for fencing, theft proof doors and windows, canopy, air conditioning, rack fixing, home decoration, engineering, etc.
Working principle of the expansion screw: put the expansion screw into the ground or wall hole, then use the wrench to tighten the nut of the expansion bolt. Bolts out while the metal sheath is not moving. Therefore, the large head of the bolt will expand the metal sheath as it fills the entire hole in the entire hole. But the extension screw cannot be pulled out.