1.Made of durable nylon: light weight, corrosion resistance, good insulation, environmentally friendly materials.^2.Daily commons needed: This assorted round washer box contains 500 pieces / 8 popular sizes including the most common and common sizes -M2 M2.5 M3 M4 M5 M6 M8 M10^3.Convenient plastic storage box: pre-classified for quick identification and protection against loss.Very convenient to use.^4.General Intended Use: Increase the contact area of the bolt or nut with the workpiece surface to prevent wear of the workpiece surface.^5.Versatile Gasket: Widely used in various fields such as semiconductor, automotive, aerospace and interior decoration. For use primarily in electrical connections, household and commercial appliances, automotive, marine, generators, machinery and installations^