HIGH QUALITY MATERIAL:304 Stainless Steel Hexagon Socket Hexagon Cap Head Bolts,Screws Nuts,Flat Washers Kits,High strength and good corrosion resistance in harsh environments such as high temperatures, cold weather and high humidity areas. They have excellent rust resistance and excellent oxidation resistance to ensure long time use. Screw combination set: total 2000 pcs 304 stainless steel screws and nuts set, 4 sizes, M2, M3, M4 M5 with matching nuts, flat washers, we add extra spring washers to prevent the bolts from loosening. Standard metric system. Nuts and flat washers expand the contact area and reduce pressure to protect screws and components. Compact and uniformly strong threads resist deformation and slippage during rolling and installation. EXCELLENT STORAGE BOX: All screws and nuts are packaged in a durable and sturdy box that can effectively withstand the weight of the entire package. In order to prevent the screws from falling out or getting lost during use, we specially pack each different type of screws for easy storage. Not only provide you with the best products, but also the best storage system. Wide range of uses:M2 M3 M4 M5 Hexagonal screws washers and nuts combination sets are widely used. Such as precision machinery, classified instruments, instruments, electronic products, household appliances, communication products, locks, lights, lamps, toys and so on. This kit is perfect for replacing damaged and missing screws. It is your perfect friend when you are angry about the lack of bolts. The kit comes in many different sizes to meet your maximum requirements.