The Tolsen 54176 is a self-drilling screw designed for fastening metal panels, aluminum, roofs, and facades. These screws feature a 4.2 mm diameter and a length of 19 mm, allowing you to secure thin metal profiles without the need for pre-drilling, which speeds up your installation process. Each pack contains 500 pieces with a zinc-plated finish that helps protect the hardware from corrosion. The countersunk head and Phillips drive ensure a flush fit and a reliable grip, making them a practical choice for contractors or homeowners working on metal cladding and roofing projects.