Material: 304 stainless steel, high hardness, corrosion resistance. They have superior rust resistance and the excellent oxidation resistance, which can guarantee long time use Standard size screws and nuts, easy to use and install Widely Used: Widely used in home and office, communication equipment, boat assembly and other industrial machinery. Ideal for use in confined areas where the head needs to be flush or below the surface. Clean and Tidy: Comes in a handy reusable plastic container with size compartments. All screws, nuts and washers will be packed in a convenient and sturdy case, can be used for an organized storage box. Easy to use and store. Sales Service - Please feel free to contact us if you have any questions. We will give you a satisfactory solution Contents: 180 Phillips flat head screws: 20 M3 5mm screws. 20 x 6mm M3 screws. 20 x 8mm M3 screws. 20 x 10mm M3 screws. 20 x 12mm M3 screws. 20 x 14mm M3 screws. 20 x 16mm M3 screws. 20 x 18mm M3 screws. 20 x screws M3 20mm. 180 Nuts: 180 Pieces 934 x M3. These pieces come in a handy reusable plastic container with storage compartments. size. The case is very easy to open and close. Easy to use and store. Material: High quality 304 stainless steel. Main color: silver. Widely Used: Widely used in home and office, communication equipment, boat assembly and other industrial machinery. Ideal for use in confined areas where the head needs to be flush or below the surface.