Product specifications: Material: Steel, zinc alloy, nylon Color: Black Size: 160 * 126 * 34.3 / 6.3 * 4.96 * 1.35 inches Premium material: The automatic spring closer is made from cold-rolled steel and zinc alloy. The use of a single-cast manufacturing process and galvanization makes the entire product durable, rust-free, and long-lasting Packaging content: After purchase, you will receive a door closer, 4 screws, an adjustment rod, and a seal for the safety door. The rust-free spring closer is easy to install and requires no additional parts Adjustable design: Our internal automatic door closer features an adjustable design. You can use the included adjustment rod to insert it into the rotating hole and adjust the closing force as needed to enhance convenience when closing the door Sound reduction: The door closer reduces noise generated when closing the door, closes it slowly to minimize damage from strong impact, and prevents you from forgetting to close the door Wide application: Our internal door closers are suitable for metal doors, fire doors, wooden doors, residential doors, and commercial doors, almost all doors under 10 kg. The modular automatic door closer is an ideal choice for doors in homes, offices, and hotel rooms Packaging content: 1 * Door closer