Features : The washer is used to reduce friction, prevent leakage, isolate, prevent loosening or disperse pressure. Provides stable for the surface of the connected parts. These gaskets are made of stainless steel material, rustproof and anti-, firm and . This kit come with washers in 5 sizes to meet your different needs. The included plastic box has multiple compartments that keep these washers sorted by size and allow you to easily find the proper one. Specification : Item Type : Washer Material : Stainless Steel Quantity : 500pcs Package List : 50 x M1.6 Flat Washer 50 x M2 Flat Washer 50 x M2.5 Flat Washer 50 x M3 Flat Washer 50 x M4 Flat Washer 50 x M1.6 Spring Washer 50 x M2 Spring Washer 50 x M2.5 Spring Washer 50 x M3 Spring Washer 50 x M4 Spring Washer