Material: chrome steel aluminum alloy does not rust. Automatic door closer made of high quality aluminum alloy with fine workmanship and reliable performance. Tension adjustable by spring and adjustable screw for slow or fast closing. (without damping effect) Suitable for left or right doors, fits doors with weight up to 39.9kg and width up to 1000mm. Maximum opening angle 175 degrees. This door closer reduces the force when closing, protects the door from damage, and reduces noise. Please measure your door before ordering. Suitable for door weight 20-40kg and door width up to 1000mm. Closing force can be adjusted using the included hex wrench, tighter or looser according to individual needs. The automatic door closer is made of stainless steel and zinc alloy, featuring one-piece molding and multi-channel assembly processes for enhanced strength and durability.