Parker Tools Kee Klamp Grub Screws are aluminum drive rivets which deter tampering with set screws as well as create a finished, aesthetic look. Drive rivets are easy to install, requiring no special tools. The drive rivet is set by striking the pin with a hammer,driving the pin flush with the rivet head and expanding the back side of the rivet.One size fits components 5-9. Rivets for components 2-4 available upon request.