The Tolsen 54161 is a self-drilling screw designed for securing metal components, profiles, and thin sheet metal. These fasteners feature a truss head and a Phillips drive, measuring 4.2 mm in diameter and 13 mm in length. Because they have a self-drilling tip, you can drive them directly into sheet metal steel or aluminum without the need for pre-drilling holes, which speeds up your assembly process. Each screw is zinc plated to provide corrosion resistance, making them suitable for both interior and exterior applications in environments with moderate humidity. This set comes in a color box containing 500 pieces, providing a generous supply for larger projects or repeated maintenance tasks.