Tough and Corrosion Resistant: Phillips flat head screws are made of carbon steel, providing durability and long-lasting resistance to corrosion. Sizes Available: A variety of screw sizes and lengths allows you to find the right fit for DIY projects and carpentry tasks. Deep Thread Design: Wood screws with deep thread design offer strong grip in various wood types and synthetic materials, reducing the risk of stripping. Functional Home Tool: Flat head screws deliver reliable holding power, ideal for carpentry, DIY applications, and use as fasteners in furniture and cabinetry. Note: Contains small parts; keep out of reach of children. Size: M4x20 (100PCS) | Color: Black High-quality carbon steel ensures strength and performance in a range of environments. Designed with sufficient stress-bearing surface for secure and firm fastening. Ease of Storage: Screws are packaged in a clear plastic bag for convenient organization and quick access to the size needed. Ideal for use in tight spaces where a flush or recessed finish is required. Widely used in household and office fixtures, communication equipment, shipbuilding, and general machinery applications. -M4x20 = 4mm (Diameter) x 20mm (Length)