A CSK Phillips Self-Tapping Screw is a fastener with a flat, countersunk head and a cross-shaped Phillips drive, designed to create its own threads in materials like wood, plastic, or thin metal without pre-drilling. The countersunk head allows the screw to sit flush with or below the surface, providing a smooth and seamless finish. ... Typically made from materials like stainless steel, carbon steel, or zinc-plated steel, these screws offer excellent strength and corrosion resistance. They are commonly used in furniture, construction, and appliance assemblies, where a secure, professional, and streamlined appearance is required.