This comprehensive 900-piece washer assortment kit includes 9 commonly used sizes (M2, M2.5, M3, M4, M5, M6, M8, M10, M12) to meet various needs for home and professional projects. Premium Material: Crafted from high-quality 304 stainless steel, these washers are strong, corrosion-resistant, and designed to withstand tough environments, including high humidity, extreme temperatures, and oxidation over time, ensuring durability and longevity. Convenient Storage Box: The washers come neatly organized in a sturdy plastic case with labeled compartments for each size, making it easy to find the exact washer you need. Wide Applications: Perfect for indoor and outdoor projects, this kit is ideal for interior decor, electrical maintenance, furniture repair, automotive work, and marine applications where threaded/bolt-type connections are used.