Tri Fold Rivet, 10 pack, .187 diameter, .157 – .472 grip. Aluminum, Black. These high quality aluminum rivets provide a quick and secure connection for installing accessories. Use in conjunction with a marine sealant for a waterproof connection. These rivets do not include a rubber o-ring which can dry rot and break down. Made in the USA Covered by our Built for Life Guarantee SKU:HRC-1001-10