Zinc plated. These Forgefix 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. They are ideal for fixing to timber in fencing and joinery applications and are zinc-plated for enhanced durability. Conforms to DIN 571 standards. Used widely in heavier timber installations and for fixing timber to masonry, also popular for satellite dish installation with a wall plug. Zinc coatings prevent oxidation and create a longer lasting finish.