Product specifications: Material: Steel, zinc alloy, nylon Color: Black Size: 160 * 126 * 34.3 / 6.3 * 4.96 * 1.35 inchesExcellent material: The automatic closing spring is made of cold-rolled steel and zinc alloy. The use of one-piece casting process and electroplating process makes the whole product durable, rust-free and durable. of life. Adjustable design: Our internal automatic door closer adopts an adjustable design. You can use the included adjustment rod to insert the rotating hole and adjust the closing force as needed to increase the convenience of closing the door. Noise reduction: The door closer can reduce the noise interference generated when closing the door, close the door slowly to reduce the damage to the door caused by violent impact, and can prevent you from forgetting to close the door. Widely used: Our interior door closers are suitable for metal doors, fire doors, wooden doors, civil doors and commercial doors, almost all doors under 10 kg. The self-closing