The Tolsen 54151 is a set of truss head metal screws designed for securing thin sheet metal, steel, and aluminum surfaces. Each screw features a 4.2 mm diameter and a length of 13 mm, utilizing a Phillips drive for a reliable grip during installation. To prevent corrosion and ensure durability, these fasteners are finished with zinc plating. This pack contains 500 pieces delivered in a colored box, making them a practical choice for technicians or DIY enthusiasts working on metal assembly projects where a wide, flat head is needed to distribute pressure across the material.