The Tolsen 54153 is a set of self-tapping screws designed for securing thin sheet metal and steel surfaces. Each screw is crafted from zinc-plated steel, which provides essential corrosion protection for projects where durability against rust is necessary. These fasteners feature a 4.2 mm diameter and a length of 25 mm, making them suitable for attaching wire lath to metal studs or joining aluminum to metal components. To ensure a secure fit, they are designed with a truss head and an integrated washer that helps distribute pressure evenly across the surface. You can easily drive them using a standard Phillips screwdriver. This pack comes with 500 pieces housed in a colored box, providing a generous supply for larger installation tasks.