The Tolsen 54178 is a self-drilling screw designed for securing metal or aluminum panels, making it a practical choice for installing roofs and facades. These screws feature a specialized tip that eliminates the need for pre-drilling, which allows you to work faster and more efficiently on site. Each screw has a diameter of 4.2 mm and a length of 32 mm, finished with a zinc-plated coating to help protect the metal from corrosion. The countersunk Phillips head ensures that the screw sits flush with the surface, providing a clean and professional finish for your construction projects. This pack includes 500 pieces, providing a generous supply for larger installations.