Zinc plated. 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. They are perfect for fixing to timber in fencing and joinery applications and are zinc-plated for even greater durability. Single thread screws for a strong, heavy-duty fixing. Hexagon head for greater torque with a socket driver. Zinc Plated (ZP) for corrosion resistance. Pack of 10.