This Diall Grey Multi-Purpose Screw & Wall Plug set (8mm x 40mm) in a pack of 10 is designed for high-performance fixing in solid substrates like brick and concrete. Featuring a durable nylon wall plug with a two-way expansion mechanism, it ensures a secure, strong hold in solid materials. Anti-rotation fins prevent the plug from spinning as the screw tightens, providing a reliable installation every time.