Welcome to our store! A variety of nut and bolt set sizes: Our screw set includes: Bolts with matching nuts, washers and gasket, M3x8, M3x12, M3x16, M3x20M4x8, M4x12, M4x16, M4x20M5x8, M5x12, M5x16, M5x20 Total number is 520. Different sizes can meet most of your needs and the needs of your home life. High quality materials: Our hex head screws are made of high quality 304 stainless steel, which has a good corrosion resistance, does not rust and is durable. Our well-made bolts and nuts fit perfectly to ensure excellent results. And the wire is smooth, sharp and burr-free. The tight thread is not easy to deform and slip when twisted. Precision design of the set of nuts, bolts and washers: the screw conforms to the standard metric system. The surface of bicycle nuts and bolts is smooth and burr-free, the thread is clear and firm, easy to embed and not easy to loosen. Use nuts and washers for a more precise assembly. Enlarged contact area reduces stress and protects parts and screws. Wide range of applications: Our m3 m4 m5 m6 nut and washer classification kits are suitable for indoor use and outdoors, are at home and at work, professionals, maintenance workers, carpentry, construction, furniture, automobiles, bicycles, home and office equipment, 3D printing projects, communication equipment, ideal tool for the ship assembly and other projects. Convenient storage and perfect after-sales service: 520 nuts and washers are arranged in the storage box, and there are stickers on the box, which can help you quickly find the nuts and bolts you need. Shipping quantity: 520 PCS/box Product color: Silver Product size: m3 M4 M5 Note: manual measurement, please allow 1 - 3cm error!!! 100 % Satisfaction - Our customers are our priority. If you find any problems with the products after receiving the goods, such as damage and incorrect quantity, please contact us immediately. We do our best to provide you with satisfactory after-sales service