Made of stainless steel material, the 304 stainless steel material provides strength and offers good corrosion resistance in many environments. Perfect 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. Total 180 pieces screws and 160 pieces nuts for general purpose use will meet your daily basic needs. Used widely in the home and office appliance, communication equipment, ship assembly and other machinery industry. These screws are made of high quality alloy steel, which provides strength and offers good corrosion resistance in many environments. Button head design is Perfect for use in confined areas as fixing component, industrial and construction fasteners. There are many length in this set which can be commonly used in home and office appliance, machinery, furniture, repair and inventions. Material: Stainless Steel Color: Silver Type: Button head hex socket Size: 5mm 6mm 8mm 10mm 12mm 14mm 16mm 18mm 20mm Size and Quantity: Screws M3 x 5mm 20pcs M3 x 6mm 20pcs M3 x 8mm 20pcs M3 x 10mm 20pcs M3 x 12mm 20pcs M3 x 14mm 20pcs M3 x 16mm 20pcs M3 x 18mm 20pcs M3 x 20mm 20pcs M3 Nuts 160pcs Package Content: 180 x Screws 160 x Nuts Only the above package content, other products are not included. Note: Light shooting 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.