Material Made of high quality 410 Stainless Steel, which has high corrosion resistance and anti-rust effect, not easy to damage, making it an excellent choice for indoor or outdoor applications. Feature The hex washer head of the screw can secure fastening and greater holding power. The self-drilling screws can be directly screwed into the metal or wood without pre-drilling, not easy to deform and slide when use, high strength, long service life. Fine Workmanship Using high precision cutting technology, the threads are very precise and clear, which can easily penetrate wood and plastic, ensuring a firm fixing. Multipurpose The Hex washer head self-drilling screws are known for their efficient application performance, widely used in construction, manufacturing, engineering, assembly, etc, ideal for use in wood, metal or other tough materials.