24-Hour Door Guardian: This universal butterfly spring door closer enables automatic door closing, helping prevent doors from being left open. It supports energy efficiency by reducing unwanted airflow. Wide Range of Applications: With an internal diameter of 0.75 inches, this spring hinge door closer fits most standard door butt hinge pins and is suitable for interior doors such as bathroom, kitchen, study, and screen doors. No-Drill Installation: Install the self-closing spring door closer without drilling holes—simply close the door, lift the hinge pin, slide the spring into place, and release. Gloves are recommended during installation due to spring tension. Durable Construction: Made of stainless steel with a chrome finish for corrosion resistance and long-lasting performance. Rubber caps on both ends help protect door surfaces. Color: Silver Material: Stainless Steel Package Contents: 8 x Butterfly Spring Door Closer