Cavity fixings are a type of fastener designed for use in hollow walls, ceilings, and other cavities where there is no solid material to anchor to. They are used to securely fasten objects such as shelves, cabinets, and pictures to these surfaces. The fixing is typically made up of two parts: a screw and a plastic or metal sleeve. The sleeve is inserted into the cavity, and the screw is then inserted into the sleeve, which expands and grips onto the sides of the cavity, providing a secure anchor point. Some of the advantages of using cavity fixings include: Can be used in a variety of hollow materials, including drywall, plasterboard, and ceiling tiles Provide a strong and secure anchor point Suitable for light to medium loads Allow for easy installation with a screwdriver Do not require specialized tools or equipment When using cavity fixings, it is important to choose the correct size and type of fixing for the load requirements and the material being anchored to. It is also important to follow the manufacturer's instructions for proper installation, and to ensure that the fixing is fully seated in the cavity before tightening. Professional installation may be required for particularly heavy loads or applications where safety is a concern.