Features: Made of 304 stainless steel material, the 304 stainless steel material provides strength and offers good corrosion resistance in many environments. Great for use in confined areas as fixing component, industrial and construction fasteners. There are many different length of button head screws that you can use for various purposes and projects. Total 480 pieces screws and nuts for general purpose use will meet your daily basic needs. Used widely on home and office appliance, communication equipment, ship assembly and other machinery industry. Specifications: Material: 304 stainless steel Grade: A2-70 Screw Type: Hex socket button head Thread: M2 or M3 or M4 Size and Quantity: M2 X 20 20pcs M2 X 16 20pcs M2 X 12 20pcs M2 X 8 20pcs M2 Nuts 80pcs M3 X 20 20pcs M3 X 16 20pcs M3 X 12 20pcs M3 X 8 20pcs M3 Nuts 80pcs M4 X 20 20pcs M4 X 16 20pcs M4 X 12 20pcs M4 X 8 20pcs M4 Nuts 80pcs Box Size: 13.2 x 7.2 x 2.3cm or 5.19 x 2.83 x 0.9" Package Includes: 1 Set x Screws and Nuts Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.