Molly Bolts are used in wallboard, plaster, paneling, doors, and other soft, hollow base material. A molly anchor works by expanding its legs after being inserted through a pre drilled hole and tightened with the screw on the head of the anchor. This pulls the legs flush to the back of the wall and the head flush to the object you are securing. Fixtures can be removed and replaced without need to replace an anchor. Steel with zinc plated finish.Hollow Wall Anchors are a heavy duty plasterboard fixing.They provide a permanent threaded anchor in cavity wallsA Molly bolt is a specific type of fixing plug for attaching heavy objects to a hollow surface. Conventional fixing plugs, by design, are not designed to support a large amount of weight and will not hold on a hollow material. With a limited flexibility, and length, they do not have a big enough surface area to establish a solid hold. In contrast, molly bolts are a perfect fit for hollow materials as they feature an increased grip surface.The body of a molly bolt is composed of a flange, a screw head, collapsing legs, a shell, an integral nut and a mechanical screw. It is effective due to its expansion through bending.Once inserted into a simple hole and crimped using a specific type of anchor pliers referred to as crimping or expansion pliers, molly bolts spread out to provide increased grip on the sides of the material. The collapsing legs will bend and spread out on the on the side of the hollow material (either umbrella or star-shaped), thus enlarging the gripping surface, resulting in an increased resistance to tearing. HIGH QUALITY MATERIAL Made of high quality zinc plated carbon steel, rust resistance, corrosion resistance and high strength, durable and sturdy enough for you to hanging items. Wall Plasterboard Fixing Anchor Plugs Molly Heavy Duty Cavity Metal Rawl Screw.