Gypsum Board Expansion Bolts Screw In Plastic Spiral Anchors Wall Fixing Plugs Product Description The product is a fastener widely used in the fields of building decoration, home installation, and industrial assembly. It is mainly composed of nylon expansion tube and matching screws, which use the elasticity and friction of the material to achieve firm anchoring. Its fixed principle is based on the "wedge-shaped expansion" mechanism. When the screw is screwed into the nylon