The Tolsen 54193 is a self-drilling roof screw designed for securing metal, plastic, or composite panels on roofs, facades, and various metal structures. These screws feature a hexagonal head and a specialized self-drilling tip, which allows you to fasten materials directly without the need for pre-drilling holes. Each screw has a diameter of 5.5 mm and a length of 38 mm, providing a reliable hold for your construction projects. To ensure a weather-tight seal, every piece includes an integrated rubber gasket that protects the connection from water and dust penetration. The zinc-plated finish adds a layer of corrosion protection, helping the fasteners withstand outdoor exposure. This set comes in a colored box containing 500 pieces, making it a practical choice for those handling larger installation tasks where consistency and durability are required.