Best Combination There are a total of 1440 pieces 304 stainless steel screws and nuts sets in 3 sizes: M2, M3, M4 with matching nuts, flat washers and spring washers meet different peoples demands. These sizes contain almost the 3 most commonly used sizes in our life, such as precision machinery, classified instruments, instruments, electronic products, household appliances, communication products, locks, lamps, lights, toys, etc.Top Quality Material Made of true 304 stainless steel, anti-rust and corrosion resistant for a long time use. With the finest manufacturing techniques, screws and nuts sets have a smooth, burr-free surface. There are very sturdy, eco-friendly and durable.Exquisite Storage Box We want our customers to be simple and clear every time they use screws and nuts, so we put 27 types bolt, nut, flat washer, spring washer in 24 grids and each grid is marked with size label. We also provide three free relevant wrenchs in our sets So you no longer need the extra purchase.1:1 Matching Spring Washer As we all know, nuts and flat washers increase the contact area and reduce stress to protect the screws and parts. And inside the screws and nuts kit, we have added extra spring washers to prevent bolt loosening.