Made of durable nylon material: low weight, corrosion resistance, good insulation, environmentally co.ukiendly materials. Needed Together Every Day: This Matching Round Spacer Box Contains 500 Pieces / 8 Common Sizes Including Most Common and Common Sizes -M2 M2.5 M3 M4 M5 M6 M8 M10 Convenient Plastic Storage Box: Pre-classified for quick identification and protection against loss. Very convenient to use. Intended use: Increase the contact area of the screw or nut with the workpiece surface to prevent the workpiece surface co.ukom wearing out. Versatile Sealing Ring: Widely used in various fields such as semiconductor, automotive, aerospace and interior decoration. Primarily for electrical connections, household and commercial appliances, cars, boats, generators, machinery and systems. Broadcast content: M2 nylon washer --- 2mmx5mmx1mm (ID * OD * thickness), 100pcs; M2 nylon washer --- 2.5mm x 5mm x 1mm (ID * OD * thickness), 100pcs; M3 nylon washer --- 3mmx6mmx1mm (ID * OD *