The Diall PZ Countersunk Hammer Fixing set (8mm x 80mm) in a pack of 10 is designed for secure and efficient installations in solid walls, brick, concrete, and stone. This hammer-in style fixing comes with a pre-fitted screw, enabling a quick, through-type installation that saves time on-site. As the nail screw is driven in, the nylon sleeve expands and anchors firmly into the building material, making it ideal for fixing timber constructions in various applications.