The Tolsen 54183 is a self-drilling screw designed to simplify the installation of metal or aluminum panels, roofs, and facades. These fasteners feature a specialized tip that eliminates the need for pre-drilling, allowing you to secure materials directly and more efficiently. Each screw has a diameter of 4.8 mm and a length of 50 mm, featuring a countersunk head with a Phillips drive for a flush finish. To protect against corrosion, they are zinc-plated, making them suitable for structural work where durability is required. This set comes with 250 pieces, providing a generous supply for larger construction or renovation projects.