These rivets do not include a rubber o-ring which can dry rot and break down.
So I like this product. Learn how to use it and it will serve you well. My kayak has limited access in the hull so aluminum rivets are a must. That said I use them with marine adhesive. Together I've mounted my fish finder and my anchor trolley with these rivets and marine adhesive. No leaks. I'm a happy customer. Mounting rivets can be tricky. Do your research. Use the right products and the right procedures and you will be as happy as I am. THANKS YAK ATTACK