High quality carbon steel. It has good machinability and high toughness up to a temperature of about 800 degrees. They have rust resistance and excellent oxidation resistance in harsh environments such as high temperature, cold temperature and high humidity area, which can guarantee a long time. Various screw sizes: M24 - M220, M34 - M330, M46 - M430 to meet different needs, it is a very important hand tool for the family. With M2, M3 and M4 nuts and washers, installations are now more precise and the contact area is enlarged, which reduces pressure and protects parts and screws. The nuts and washers are arranged in a storage box, with which you can easily find your way around the series and avoid losing them if necessary. They are antioxidant 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. Material Carbon Steel. It