520PCS Kit M3 M4 M5 M6 Stainless Steel Hex Head Button Socket Head Cable Bolts Screws with Nuts Assortment - Sold By VIGRUE (520PCS Kit) ✔ Various Screw Sizes:M38,M3 12,M316,M320,M48,M412,M416,M420,M58,M512,M516,M520,M68,M612 ,M616,M620, to meet different needs. It is a very essential manual tool for the family. ✔ With M3, M4, M5 and M6 nuts and washers, installations are now more precise with an increase in the contact surface, this which reduces the pressure and protects the parts and screws. ✔ The nuts and washers are arranged in a storage box, which makes it easy for you to find your way through the series and prevent the loss of when needed. ✔ They are anti-oxidant and corrosive even at high temperatures. 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.