DURABLE MATERIAL: Made of durable nylon, light weight, corrosion resistance, anti-tear, resist deformation and compression, good insulation, eco-friendly materials.<br> <br> Portability and use easy: A variety of sizes and thicknesses available in one box, easy to carry, and again, very easy to use.<br> <br> General Intended Use: Increase bolt contact area or of the nut with the surface of the workpiece to prevent the wear of the surface of the workpiece.<br> <br> Versatile sealing gasket: Widely used in various fields such as semiconductors, automotive, aerospace and interior design. Mainly used in electrical connections, household and commercial appliances, car, marine, generators, machinery and installations.<br> <br> PACKAGE: The box contains 500 pieces of plastic grommets of 8 different sizes.(M2 X100, M2.5 X 100, M3X80, M4X50, M5X50, M6X50, M8X50, M10X20).