Excellent material: M3, M4, M5, and M6 nuts and bolts are made of high-quality galvanized carbon steel, offering high strength, resistance to breakage and deformation, and good corrosion resistance for durability and stability.durable. Set of countersunk hexagonal head screws, bolts, nuts and washers: clean thread, uniform pitch, countersunk hexagonal design, with sufficient force surface, can be easily tightened and loosened with the included wrench. Hex nuts and flat washers: Nuts can make your installation more precise, tighten better, and support a greater load; flat washers can increase the contact area, protect the bolts, and extend their lifespan.of life, providing strong holding force and maximum clamping force.Wide application: Ideal for woodworking, furniture assembly, precision machinery, adjusting instruments, electronic equipment, household appliances, vehicle maintenance, and other fields. An essential kitFor professionals, homeowners, and DIY enthusiasts.The package includes: a total of 1080 pieces, including sizes M3, M4, M5, and M6, along with corresponding nuts and washers, and M3, M4, M5, and M6 wrenches, providing a sufficient quantity and a wide range of sizes to meet your needs.to meet the usage needs of multiple scenarios and domains.