Called the Scotty No. 132 Extra Long Grip Mounting Rivets, but have more or less the same specifications as all the other rivets sold at TopKayaker. 3/8 to ½ inch grip range. The Scotty structural rivets are an excellent solution for mounting hardware where you don't have access to the back side of a fastener. Great for mounting to thin-walled watercraft such as kayaks, these rivets are designed to butterfly open to spread the mounting load over a greater area. 10 rivets per package. Please Note: These rivets are not compatible with the No. 241 or 241L Combination Side-Deck Mounts. RVT-HDW