Premium 304 Stainless Steel Construction: Our Metric Hex Bolt, Nut Washer Assortment Kit is crafted from high-quality 304 stainless steel, ensuring exceptional rust resistance, wear resistance, and durability. This material is designed to withstand oxidation and corrosion, making it an ideal choice for various applications where longevity and reliability are essential. Versatile Hex Bolts, Nuts, and Washers: The kit features an external hexagonal design that maximizes the preloading contact area, allowing for the application of substantial preloading force. This design not only facilitates ease of installation and disassembly in confined spaces but also ensures a compact structure that minimizes the risk of loosening, while providing a commendable load-bearing capacity. Comprehensive Assortment: Included in the kit are hex nuts and two types of washers. The hex nuts enhance the precision of your installation, ensuring a secure fit and improved load-bearing capabilities. The flat washers increase the contact area for a stronger hold, while the spring washers provide necessary tension and preload in joint assemblies, making this kit a versatile choice for various projects. Wide Application Range: This assortment kit is suitable for a multitude of uses, including mechanical equipment, classified instruments, meters, household appliances, electronic products, communication devices, locks, lamps, and maintenance industries. It is an excellent choice for professionals, maintenance personnel, carpenters, landlords, handymen, and repair technicians. Extensive Package Contents: The kit contains a total of 496 pieces, including a diverse range of sizes: M4 (12 mm, 16 mm, 20 mm, 30 mm), M5 (16 mm, 20 mm, 25 mm, 30 mm), and M6 (16 mm, 20 mm, 30 mm, 40 mm), along with corresponding nuts and washers. This comprehensive assortment ensures that you have the right components on hand to meet your daily needs. Key Features ? Constructed from high-quality 304 stainless steel for enhanced durability and rust resistance. ? External hexagonal design allows for a larger preloading contact area, providing a secure fit. ? Includes both flat and spring washers to increase contact area and reduce stress on components. ? Organized in transparent boxes with clear size labels for easy storage and quick access. ? Ideal for a wide variety of applications, including precision machinery and household repairs.