Excellent material: The automatic door closer is made of stainless steel and zinc alloy, adopts integrated molding process and multi-channel assembly process, makes the whole product durable and sturdy. Adjustable tension: firm - Quality zinc alloy automatic door, hand-free adjustable tension, adjustable screws for slow or fast closing. Choose your return speed according to the environment it is close in. Size: about 16 x 12 x 3 cm, suitable for door weight 20-30 kg, door width 1000 mm, universal design, hinged door right or left, ideal for home, office, hotel room doors. Precautions: please measure the doors before ordering, suitable for door weight 20-30 kg, door width 1000 mm. Noise reduction: the door closer can reduce the noise generated when the door is closed, close the door slowly to reduce the damage to the door caused by strong impact and can prevent you from forgetting to close the door.