[Various Sizes]: There are a total of 580 pieces of 304 stainless steel flat washers in 9 sizes: M2 M2.5 M3 M4 M5 M6 M8 M10 M12. These sizes contain almost the 9 most commonly used sizes in our life. [Superior 304 Stainless Steel]: The flat washers are made of superior 304 stainless steel which has the advantages of high hardness, corrosion resistance and rust resistance. [Exquisite Storage Box]: We want our customers to be simple and clear every time they use flat washers. [Uses]: When not in use, you can store the washer in its storage box, this can be placed neatly on a shelf, in a toolbox or inside a drawer. These kits can be used in the home, shed, workplace, factory, woodworking or metal shop. Use with screws, bolts, and nuts of the same size when building decks, fences, electrical connections, building furniture such as beds or tables, appliances, outdoor DIY projects, car repairs, electronics, instruments, computers, and marine uses.