It is an authentic OEM sourced item which is specially produced for use with snowthrowers, generators, and rear engine riders made by Murray, Briggs & Stratton, Snapper, and Simplicity. The nut is made of metal and attaches to the starter switch. During replacement, it may require a wrench to help install this part correctly. It may becom...Read moree broken or stripped and will need to be replaced. This part is available as an individual replacement.