High-quality materials: The screw hanger is made of galvanized carbon steel, which is better than ordinary steel, providing solid structural support for the threaded rod in pipeline applications, rust-proof and not easy to break, it can maintain the original quality even if it is used for a long time, it is easy to install, the design of the ceiling hanger is quick and easy to install, suitable for indoor and outdoor use, saving your time and energy, widely used, suitable for indoor and outdoor use, industrial shelves, curtain rods, mailboxes, Table & Barn, Package Contents, 20 Ceiling Flange Hanging Panels, Surface Electrogalvanized Finish, Enough for Most of Your Hanging Needs, If you have any questions or suggestions, please contact us in time, your satisfaction is our top priority