520pcs M3 M4 M5 M6 Kit Stainless Steel Hex Socket Cable Bolts with Nuts Assortment (520pcs Kit) Various Screw Sizes: M38, M312, M316, M3 20, M48, M412, M416, M420, M58, M512, M516, M520, M68, M612, M616, M620 , to meet different needs. It is a very essential hand tool for the family. With M3, M4, M5 and M6 nuts and washers, fittings are now more precise with an increase in the contact surface, which reduces pressure and protects parts and screws. The nuts and washers are arranged in a storage box, which makes it easy to find them in the series and avoid loss if necessary. They are anti-oxidizable and corrosive even at high temperatures. 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 304 High quality stainless steel. It has good workability and high toughness up to a temperature of about 800 degrees. Anti-rust Corrosion resistance No