This is a genuine Toro replacement part that has been sourced from the original manufacturer to be used with snowthrowers. The metal flat washer is used to disperse pressure put on a part assembly by a nut or bolt across a wider surface area. This item is used with several different models of snowthrowers. It is recommended to review your...Read more model\\\'s part diagram to confirm the washer\\\'s compatibility and usage. The flat washer is priced individually.