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 durability. Single thread screws offer higher pull-out values and quicker insertion. Conforms to DIN 571 standards. Suitable for heavy timber installations and securing timber to masonry. Also used for satellite dish installations with wall plugs.