Made of durable nylon: Lightweight, corrosion-resistant, good insulation, and environmentally friendly materials. Intended for general use: Increases the contact area between the bolt or nut and the surface to prevent wear. This pack of assorted round flat washers includes 500 pieces in 8 popular sizes: M2, M2.5, M3, M4, M5, M6, M8, and M10. Convenient plastic storage box: Pre-sorted by size for quick identification and secure storage. Easy to use and organize. Widely used in various applications such as electrical connections, household and commercial appliances, automotive, marine, generators, machinery, and interior decoration. Suitable for use in semiconductor, automotive, aerospace, and industrial sectors. Package Includes: - M2 Nylon Flat Washer 2mm x 5mm x 1mm (ID x OD x thickness), 100 pcs - M2.5 Nylon Flat Washer 2.5mm x 5mm x 1mm (ID x OD x thickness), 100 pcs - M3 Nylon Flat Washer 3mm x 6mm x 1mm (ID x OD x thickness), 100 pcs - M4 Nylon Flat Washer 4mm x 8mm x 1mm (ID x OD x thickness), 50 pcs - M5 Nylon Flat Washer 5mm x 10mm x 1mm (ID x OD x thickness), 50 pcs - M6 Nylon Flat Washer 6mm x 12mm x 1.2mm (ID x OD x thickness), 50 pcs - M8 Nylon Flat Washer 8mm x 16mm x 1.4mm (ID x OD x thickness), 40 pcs - M10 Nylon Flat Washer 10mm x 20mm x 2mm (ID x OD x thickness), 10 pcs