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: M2*4 - M2*20, M3*4 - M3*30, M4* 6 - M4*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 the contact surface, which reduces the pressure and protect 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 when needed. They are anti-oxidant and corrosive even at high temperature. The main use of stainless steel hex screw is very common in electronics, for 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 of about