Made of stainless steel material, the stainless steel material provides strength and offers good corrosion resistance in many environments. Perfect for use as fixing component, industrial and construction fasteners where you need hex socket cap head screws. M2, M3, M4 thread with many common length that you can use for general purpose. These screws and nuts will be great replacement for industrial and construction fasteners. Used widely in the home and office appliance, communication equipment, ship assembly and other machinery industry. These screws and nuts are made of 304 stainless steel, which is resistant to rust and corrosion. There are M2, M3, M4 screws of many lengths in this set which can be commonly used in home and office appliance, machinery, furniture, repair, inventions and other projects. Material: 304 stainless steel Grade: A2-70 Color: Silver Type: Hex socket cap head Standard: Metric Size & 1 set 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 / 5.19 x 2.83 x 0.9 inche Package Includes: 2 set of 480 Pcs hex screw and nut fasteners Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.