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 perfect for fixing to timber in fencing and joinery applications, and are widely used in conjunction with nylon wall plugs, particularly in the satellite industry. Conforms to DIN 571 standards. Zinc coatings prevent oxidation and create a longer lasting finish. Single thread screws offer higher pull-out values and quicker insertion.