The spax factor for the craftsman that concentrates on the details we work for you. For the pro that puts qualify first we help you create stronger connections enhance performance and improve results when your reputation is on the line. This high performance wood screw is not your average screw. While it is designed for wood applications it is also functional for other materials like masonry drywall plastic and up to 24ga steel. Masonry and concrete do require pre-drilling. It is made with carbon steel and coated for durability to fasten strongly and securely.