Excellent Material: The flat washers are made of outstanding plastic nylon material, which is lightweight, corrosion-resistant, tear-resistant, deformation-resistant, and compression-resistant. It has good heat insulation and is durable for long-term use. ****Includes 100*M2, 100*M2.5, 100*M3, 50*M4, 50*M5, 50*M6, 50*M8, 20*M10. Good Performance: The round washers can increase force, reduce friction, and prevent local damage. This nylon spacer has a certain insulation and protective effect, extending the equipment's lifespan. Easy to Use: You just need to choose an insulating washer that fits the hole diameter and install it under the screw, suitable for installing furniture and repairing electrical appliances. The washer has good impact resistance, reduces vibration, and prevents damage. Easy to Store: These screw washers are placed in a plastic box, making them easy to organize, transport, and find the desired size, catering to your various needs and most daily installation and DIY requirements. Wide Application: Assorted nylon spacers are widely used in household appliances and industries, primarily for electrical connections, trade, automotive, marine, general plumbing, generators, machinery, and equipment, and more.