These rods can be used as an extension to supplied finial rod. The extension rod assists when installing finial into a cupola or other feature that additional rod length is needed to reach the mounting hardware. All rods have male and female ends so they can be joined together. Choose length as needed. These are assembly rods for the Mini Finials (products with item numbers ending in "X"). They are really just a replacement part as they do come with those specific finials when ordered.