Zinc plated. These coach screws are tough, reliable and easy to use with a sharp tip and coarse thread for a firm and secure fit. The traditional hexagon head allows for greater torque with a socket driver. Ideal for fixing to timber in fencing and joinery applications. Zinc-plated for increased durability and corrosion resistance. Conforms to DIN 571 standards. Application: Used widely in heavier timber installations and for fixing timber to masonry. Also popular as a fixing for satellite dish installation together with a rimmed or rimless wall plug.