Zinc plated. Looking for a strong and heavy-duty fixing when working with timber? These coach screws are tough, reliable and easy to use - with a sharp tip and coarse thread, they're easy to insert for a firm and secure fit, and the traditional hexagon head allows you to achieve even greater torque with a socket driver. * Single thread screws for a strong, heavy-duty fixing * Hexagon head for greater torque with a socket driver * Perfect for fixing to timber in fencing and joinery applications * Zinc-plated for even greater durability These Forgefix single thread Coach Screws are Zinc plated for increased durability. They feature a hexagon head for greater torque with a socket driver and are perfect for fixing to timber in fencing and joinery applications.