High quality 304 stainless steel. Stainless steel is a common material with a density of 7.93 g/cm3, also called 18/8. It has good machinability and high toughness, and the temperature can reach about 800 degrees. Various screw sizes: M24-M220, M34-M330, M46-M430, to meet different needs. It is an indispensable hand tool for the family. By using M2, M3 and M4 nuts and washers, the installation is now more precise and the contact surface is increased to reduce stress and protect parts and screws. Nuts and washers are provided in the storage box, so you can easily find the collection and avoid losing it when you need it. Anti-oxidant and corrosive even at high temperature, the main use of stainless steel hex screws is very common in many fields such as electronics, electrical appliances, products chemicals, water conservancy, machinery and equipment, furniture, etc. Specifications Material: high quality 304 stainless steel Features: corrosion resistance, no pollution, high