10g - 16 x 40mm - 1000pc Countersunk Head Square Drive Winged Metal Self Drilling Screws Galvanised Class 3

10-16 x 40mm Galvanised Winged Self Drilling Screws Metal/Timber x 1000pc

*Square Drive

*Countersunk Self Embedding Head

*Winged Self Drilling Point

*Coarse Thread

*Galvanised (Climogard)

*Ideal for decking boards to steel joists

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.