Self Drilling Screws – Modify Truss Phillips (TPZ) Zinc Plated #8 x 1" (4.2x25mm) (900 PCS) are designed for quick and efficient fastening in sheet metal and light structural applications without the need for pre-drilling. Manufactured from high-strength carbon steel and coated with zinc plating, these screws offer good durability and corrosion resistance for long-term use. Zinc plating forms a protective barrier that helps prevent rust and oxidation in normal environments