304 high quality stainless steel. It has good workability and high toughness up to a temperature of about 800 degrees. Various sizes of screws: M3*8mm, M3*12mm, M3*16mm, M3*20mm, M4*8mm, M4*12mm, M4*16mm, M4*20mm, M5*8mm, M5*12mm, M5*16mm, M5*20mm, M6*8mm, M6*12mm, M6*16mm, M6*20mm, to meet different needs. It is a very essential hand tool for the family. With M3, M4, M5 and M6 nuts and washers, the installations are now more precise with an increase in the contact surface, which reduces the pressure and protects the parts and screws. The nuts and washers are arranged in a storage box, which allows you to easily find the series and avoid loss when needed. They are anti-oxidizing and corrosive even at high temperature. 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. Products include: M3*8 /12/16 /20mm, 10 Pieces each; M4*8 /12 /16 /20mm, 10 Pieces each; M5*8/12