12g x 45mm - 1000pc Countersunk Winged Metal Self Drilling Screws Square Drive Galvanised Class 3

Galvanised Countersunk Winged Self Drilling Screws have a hardened self drilling point which cuts through mild steel without the need for pre-drilling. However for thick or hardened steel, pre-drilling may be required. The Self Drilling Wing helps prepare the timber for countersinking, whilst the self embedding nibs help to penetrate when countersinking. The galvanised coating is suitable for most outdoor applications. The Galvanised Countersunk Winged Self Drilling Screw is often used to attach fence pickets to a steel frame, or attaching merbau/treated pine to steel battens. The square drive gives a nice finish.