These Tolsen self-drilling metal screws are designed to simplify your fastening tasks by eliminating the need for pre-drilling holes in metal surfaces. Each pack contains 500 pieces with a 4.8x25mm size and a zinc-plated finish that helps protect the hardware from corrosion over time. Featuring a Phillips cross-head for a secure grip during installation, these screws provide the ideal length for materials requiring a 25mm depth. This makes them a practical choice for various metal construction and repair projects.