Set rivets with ease using the TierraCast 4mm rivet setter. Simply place this tool over the rivet you want to set and strike with a hammer. The hexagonal edges of this tool make it easy to grip and keep in place while using. This rivet setter works with rivets that are 4mm in size. Rivets make excellent embellishments in leather designs or mixed media projects. If you want rivets in your projects, you need this rivet setter.