High quality 304 stainless steel. Stainless steel is a common material with a density of 7.93 g/cm3, also called 18/8. It features good workability and high toughness up to a temperature of about 800 degrees. Various screw sizes: M3*6, M3*8, M3*10, M3*12, M3*16,M3*20,M4*6,M4*8,M4*10,M4*12,M4*16,M4*20,M5*6,M5*8,M5*10,M5*12,M5* 16,M5*20,to meet different needs. It is a very essential hand tool for the family. With M3, M4 and M5 nuts and washers, installations are now more precise with an increase in the contact surface, which reduces the pressure and protects parts and screws. Nuts and washers are arranged in a storage box, which makes it easy for you to find the series and avoid loss in the event of need. They are anti-oxidizable and corrosive even at high temperatures. The main use of the stainless steel hex screw is very common in electronics, electrical appliances, chemicals, water, machinery and equipment, furniture and many other fields. Material High quality 304 stainless steel. It features good workability and high toughness up to a temperature around 800 degrees. Anti rust Corrosion resistance Pollution-free Product Quality < p>Premium Material High Hardness Screw Dimension M3*6 M3*8 M3*10 M3*12 M3*16 M3*20-- 25 Pieces each M4*6 M4*8 M4*10 M4*12 M4*16 M4*20--15 Pieces each M5*6 M5*8 M5*10 M5 *12 M5*16 M5*20--10 Pieces each M3 washer M3 nut------150 Pieces each M4 washer M4 nut----- 90 Pieces each M5 washer M5 nut------60 Pieces each Accessories M3 Hex Allen key-Diameter:2.5mm Length:19* 55mm M4 Hex Allen Wrench-Diameter:3.0mm Length:23*57mm M5 Hex Allen Wrench-Diameter:4.0mm Length:24*65mm Warning: The products contain small parts. Please do not allow children to play to avoid accidental swallowing. Application The main use of the stainless steel hex screw is very common in electronics.P for electrical appliances, chemicals, water, machinery and equipment, furniture and many other areas.