Adjustable tensionThis automatic door closer has an adjustable design, you can freely adjust the closing force with the provided adjustment lever, which increases the comfort and ease of use when closing the door . Zinc Alloy + Stainless Steel: The automatic door closer is made of high quality zinc alloy and stainless steel, and the one-piece design plus galvanizing process makes the door closer to rust-proof spring, corrosion-resistant and durable. Quiet Noise ReductionThe automatic door closer uses nylon rollers which are not only quiet during use, but also reduce the noise generated during use. closing the door and reduce the damage to the door caused by the strong impact when closing. Also prevents you from forgetting to close the door. Size: the size of the automatic door closer is about 6.5 x 4.9 x 1.2 inches, suitable for doors of all sizes. weight of 20-40 kg, the maximum width of the door is 1000 mm. The spring door closer is designed with left and right doors and can be used on the left or right, making it ideal for home use, hotels, offices and dormitories.