Specifications: Designed with 304 stainless steel material, the 304 stainless steel material provides strength and offers good corrosion resistance in many environments. Perfect for use in confined areas where the head needs to be flush or below the surface. Fixing component, industrial and construction fasteners. Widely used in the home and office appliance, communication equipment, ship assembly and other machinery industry. Item Name: Screw and Nut Kit Material: 304 Stainless Steel Drive Type: Hexagon Socket; Head Style: Button Head Quantity: 500Pcs Features: Durable, Corrosion Resistant, Easy to Use Box Size: 19cm x 14cm x 4cm/7.48" x 5.51" x 1.57" (Approx.) Notes: Due to the light and screen setting difference, the items color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 120 x M3 Nuts 30 x M3 * 8mm Screws 30 x M3 * 12mm Screws 30 x M3 * 16mm Screws 30 x M3 * 20mm Screws 80 x M4 Nuts 20 x M4 * 8mm Screws 20 x M4 * 12mm Screws 20 x M4 * 16mm Screws 20 x M4 * 20mm Screws 50 x M5 Nuts 15 x M5 * 8mm Screws 15 x M5 * 12mm Screws 10 x M5 * 16mm Screws 10 x M5 * 20mm Screws 3 x Wrenches