This pack contains 150 self-drilling screws, each 4 inches long, designed for fast and efficient fastening without the need for pre-drilling. Ideal for metal-to-metal or metal-to-wood applications, these screws feature a built-in drill bit tip that cuts through materials easily, saving time and effort. Made from durable, corrosion-resistant materials, they are perfect for roofing, construction, or general-purpose use, providing strong, secure holds in a variety of environments.