High quality: Made of durable 410 stainless steel for perfect protection against corrosion, high hardness, and stability. Stainless self-tapping screws for indoor and outdoor use. Suitable for metal, wood, plastic, and other similar materials. Self-drilling tip: Can be drilled directly into any metal surface without the need for pre-drilled holes. Easy to remove with a screwdriver or drill. Phillips and notch design: Prevents lateral slipping. Easy to install and saves time. Convenient storage and classification: Storage box for neatly sorting screws. Sizes indicated on the lid for easy identification. Mixed sizes: 6 sizes of self-tapping screws for sheet metal. Ideal for various needs.