Grommet & Washer, size #1, BRASS. Same used in our hitches we manufacture. Non rusting brass. This is the size used on all our hitches for the hole where the cord goes through the hitch (except short stag hitches which use a smaller one). You can get cheaper ones elsewhere, but be careful, you get what you pay for. If you make hitches for resale, ask us about large quantity discounts.