304 high quality stainless steel. Stainless steel is a common material with a density of 7.93 g/cm3, also known as 18/8. It has good machinability and high toughness up to a temperature of about 800 degrees. li> Different screw sizes: M2.4.M2.20, M3.4.M3.30, M4.6.M4.30 to meet different requirements. It is a very important manual tool for the family. With M2, M3 and M4 nuts and washers, installations are now more precise with an enlarged contact surface that reduces pressure and protects parts and screws. li> Nuts and washers are arranged in a storage box, so you can easily navigate the sets and avoid losses if necessary. li> They are also antioxidant and corrosive at high temperatures. The main application of stainless steel hexagonal screws is very common in electronics, electrical appliances, chemicals, water, machinery and equipment, furniture and many other fields. Dimensions: 304 High quality stainless steel. It has good machinability and high toughness up to a