High quality carbon steel. It has good workability and high toughness up to a temperature of about 800 degrees. They have rust resistance and excellent oxidation resistance in bad environment. such as high temperature, cold weather, and high humidity areas, which can guarantee long time using Different screw sizes: M24/6/8/12/16/20, M34/8/12 /16/20/30, M4*6/10/14/18/20/30, to meet different needs. It is a very essential hand tool for the family. With M2, M3 and M4 nuts and washers, installations are now more precise with an increase in contact area, which reduces pressure and protects parts and screws. M2 M3 M4 bolts, nuts and pucks are stored in a storage box so you can easily find your way through the range and avoid losing them when needed. They are anti-oxidizable and corrosive even at high temperatures. The main use of stainless steel hex screw is very common in electronics, electrical appliances, chemicals, water, machinery and equipment, furniture and many other fields.