520 Stainless Steel Screw Kit M3 M4 M5 M6 Hex Socket Bolts Hexagon Socket Bolts Screws with Nuts Assortment (520 Piece Kit) Different Sizes of Screws: M3/M4/M5/M6*8/12/16/20 to meet different needs. It is an indispensable hand tool for the family. With M3, M4, M5 and M6 nuts and washers, the installation is now more precise and the contact surface is increased to reduce stress and protect parts and screws. M3 M4 M5 M6 bolts, nuts and washers are stored in a storage box so you can easily find your way around the cooker and avoid them lose when you need them. They resist oxidation and corrosion even at high temperatures. The main uses of stainless steel hexagon socket screws are very common in many fields such as electronics, electrical appliances, chemicals, water conservancy, machinery and equipment, and furniture.