50Pcs ST4 X 20Mm Pan Head Self Tapping Screws For Metal, Black

1. What is this?These Copper plating carbon steel self drilling screws are precision-engineered, offering both corrosion resistance and a polished finish. Designed for applications, they feature a pan phillips head for maximum torque control and a self-tapping drill tip that cuts through metal, wood, and plastic without pre-drilling.2. What will I get?Pan Head Cap Self ScrewsTotal size: 20x7mm/0.79x0.28 Inch(LxD);Screws: 18x4mm;Specification: ST4 x 20mm;Color: Gold;Material: Copper plating carbon steel;Package Included: 50Pcs x self-tapping screws.3. Are there any advantages of the product?1. Ultimate Durability: Copper plating carbon steel resists rust and harsh weather (perfect for outdoor projects).2. Time-Saving Design: Self-drilling tip eliminate the need for holes—attach materials in seconds with a standard hex driver or drill.3. Multi-Purpose Use: Works seamlessly on metal sheets, wooden frames, and composite materials.4. How to use it?1. Position the screw perpendicular to the workpiece.2. Drive with a phillips at medium speed until the head is flush. Avoid over-tightening to prevent stripping.What should I notice?1. Not recommended for concrete or hardened steel surfaces.2. Store in a cool, dry place to maintain coating quality.3. Wear work gloves to prevent fingerprints on the finish during handling.