The Tolsen 54128 is a self-drilling screw designed specifically for securing metal sheets, profiles, and aluminum components. These fasteners feature a 4.8 mm diameter and a length of 50 mm, utilizing a Phillips head for a secure and reliable drive. Because they are self-drilling, you can install them directly into your workpiece without the need for pre-drilling holes, which saves time during assembly. A galvanized zinc coating protects the metal from corrosion, making them suitable for various structural environments. This set comes with 250 pieces organized in a colored box for easy storage.