24-Hour Door Guardian: This universal butterfly spring door closer helps doors close automatically, addressing issues of doors being left open by family members or pets moving in and out freely. It also assists in maintaining indoor temperature by preventing the loss of cooled or heated air, enhancing convenience. Wide Range of Applications: Featuring an internal diameter of 0.75 inches, this spring hinge door closer fits most standard door butt hinge pins and is suitable for various types of interior and exterior doors, including bathroom, kitchen, study, and screen doors. No-Drill Installation: Install the self-closing spring door closer without drilling. Simply close the door, remove the hinge pin, slide in the door closer spring, and allow it to expand into place. This tool-free, hole-free installation is quick and easy. Due to the spring tension, wearing gloves during installation is recommended. Durable Steel with Rubber-Wrapped Design: Constructed from stainless steel with a chrome finish, this hinge pin door closer offers durability and a clean appearance. The ends are coated with rubber to prevent damage or marks on the door surface. Color: Silver Material: Stainless Steel Package Contents: 8 x Butterfly Spring Door Closer Note: Light reflection and differences in display screens may cause slight variations between the color shown in the image and the actual product. Measurement tolerances may vary by +/- 1-3 cm.