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 40 pcs M3 x 6mm 40 pcs M3 x 8mm 40 pcs M3 x 10mm 40 pcs M3 x 12mm 40 pcs M3 x 14mm 40 pcs M3 x 16mm 40 pcs M3 x 18mm 40 pcs M3 x 20mm 40 pcs M3 Nuts 320 pcs Package Content: 360 x Screws 320 x Nuts