About this article. High quality stainless steel flat washer. Durable stainless steel material that lasts a long time. Various Sizes Flat Washer: M2 50PCS, M2.5 50PCS, M3 50PCS, M4 50PCS, M5 50PCS, M6 50PCS, M8 40PCS, M10 20PCS, to meet different needs. It is a very essential manual tool for the family. With Flat Washers, the spring washer device is employed under the nut to prevent the nut from coming loose. Grower washers are used for loosening, flat washers have no loosening function, and flat washers only increase the contact area. Quality Design: With a plastic storage box, it’s easy to sort these flat washers by size and find the ones you need. Wide Application: Perfect for electrical connections on household and commercial appliances, automotive and marine uses.