1. Material: Self-tapping screws are made of carbon steel, high strength, head for white spray, more beautiful, screw zinc plating finish, rust prevention, wear resistance and corrosion resistance, very durable. 2. Advantages: The flat head design allows these screws to be inserted flush with the surface. The self-tapping design allows faster screwing into hardwood, reducing cracking problems. For different materials, even wood materials, spray metal sheets or other materials, cross grooves are easy to drill into. 3. Application: Flat head Phillips self-tapping screws are mainly used on different occasions such as furniture, wardrobe, office furniture, wooden doors, toilet equipment and so on. Widely used in electronics, communication, power products, and floor fastening applications. Product Name: Flat Head Phillips Screws/Self-drilling Screws Material: Carbon Steel Surface Finish: Zinc Plated(Screw), Spray(Head) Dimension: ST3 x 20mm / ST3 x 0.79"(Thread D* Total L) Head Size: 5.5 x 2mm / 0.22" x 0.08"(D*T) Package Content: 50pcs x Self-tapping Screws