This is a genuine Ariens replacement part. The locking washer is designed by the manufacturer for use in snowblowers and snow brushes. This part is made of metal, and may be found in various locations in the machine, depending on model. Please be aware that there are different washers used in the machine. Refer to the parts diagram to...Read more be sure of ordering the correct part. You will require a wrench when replacing this item. This part is sold individually.