Super strong exterior wood screws from Carpenters Mate feature a self-countersinking square drive head and are manufactured from the same corrosion-resistant carbon steel as the Pro Hex Screws also stocked by Fencing Essentials, making them perfect for outdoor applications such as fencing, decking and landscape projects. Carpenters Mate Deck Screws are a specially designed heavy-duty option that allows you to hold multiple timbers together in the most challenging of conditions. The screws are durable and thoroughly resistant to corrosion, allowing them to withstand the harshest conditions, making them perfect for outdoor use with decking, landscaping and roofing projects.