Premium Material: Our mixed hex head cap screws and nuts and flat washers are made of outstanding metal material with smooth edges, which offers good corrosion resistance, rust resistance, and oxidation resistance, ensure long time using. Easy to Use: These assorted nuts and bolts and washers sets are easy to use. Our screw thread is smooth, clean, and accurate. And the compact thread is not easy to out of shape and slid in the process of rolling. Easy to Store: All M3 M4 M5 M6 cross pan head machine screws and bolts and nuts and washers are stored in a separate girds plastic storage box, easy to store, use, carry, and get it, perfect to replace broken and missing screws. Wide Applications: This package includes a variety of popular sizes of screws, nuts, and washers, commonly used in machinery, furniture, car, motorcycle repair, environmental protection equipment, 3D printing equipment, communication equipment, power facilities, electronic products, ship assembly, and DIY inventions, and more. Package Includes: You will receive 16 kinds of screws, in the size of M3*6mm, M3*10mm, M3*14mm, M3*20mm, M4*10mm, M4*20mm, M4*25mm, M4*30mm, M5*20mm, M5*30mm, M5*40mm; m6*10, m6*20, m6*30, m6*40; 4 kinds of nuts, and 4 kinds of washers; a total of 900g/1080 pcs, meet your different needs in daily life.(Please check the product details for the quantity corresponding to the specific size.)