1. Product Name & Standard Official Name: Phill Flat Head Self Drilling Screw With 4 Nibs Under Head 2. Structural Features Countersunk (flat) head design with a Phillips cross recess, allowing flush installation with the surface. Full-thread shank with a sharp, self-cutting pointed tip (with cutting notch). 3. Material & Strength Grade Main material: Carbon steel (e.g., C1022A), heat-treated for high hardness and torsional strength. 4. Surface Treatment Common finishes: Electro-galvanizing (clear/blue-white zinc, as shown). Custom anti-corrosion coatings are also available. 5. Key Advantages Countersunk design ensures a flat, protrusion-free surface after installation. Sharp pointed tip with cutting notch enables rapid self-tapping, reducing the need for pre-drilling. Phillips drive allows high torque transfer and minimizes cam-out. 6. Application Scenarios Extensively used for light gauge sheet metal connection, furniture installation, wood fastening, and plastic assembly.