High Quality Material Made of high quality 410 Stainless Steel, which has high strength, hardness, and anti-rust effect. The black coating provides enhanced corrosion protection making it an excellent choice for indoor or outdoor applications. Rich Features The hex washer head of the screws can secure fastening and greater holding power, distribute the load, offering protection to the mating surface. No need for pre-drilling, sharp self-drilling point can directly drill into metal surface, making the fastening process more efficient. Hexagon head design is convenient and quick to install. Fine Workmanship Using high precision cutting technology, the threads are precise and clear, and can easily penetrate wood and plastic, ensuring a firm fixing. Multipurpose The Hex washer head self-drilling screws are ideal for use in wood, metal or other tough materials, widely used in construction, manufacturing, engineering, assembly, etc.