How do molly screws work?

Molly screws, or molly bolts, are a type of anchor used for hanging objects on hollow walls, such as drywall. They consist of a metal sleeve and a screw; when the screw is inserted and tightened, it expands the sleeve behind the wall, creating a secure grip. This expansion distributes the weight of the object across a larger area, allowing for a strong hold without damaging the wall. Once installed, they can support a significant amount of weight, making them ideal for hanging heavy items.