✔ 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 workability and high toughness up to a temperature of about 800 degrees. ✔ Different screw sizes: M24 - M220, M34 - M330, M4 6 - M430, 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 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 in the event of need. ✔ They are anti-oxidant and corrosive even at high temperature. water, machinery and equipment, furniture and many other areas.