Grade aluminum alloy surface mounted automatic door closer, fine workmanship and reliable. Spring with adjustable tension, adjustment screw for slow or fast closing. Material: alloy body of aluminum + chrome steel accessories; The bracket is made of chrome plastic, plastic brackets are used to avoid metal friction noise (do not overtighten when installing) Suitable for left or right opening doors, The door frames and the doors should be parallel, If the door frame is higher than the door, you should use the material to lift the bracket and parallel to the door frame door. Door weight 39.9 kg, Door width 1000 mm, Door opening angle up to 175 . Including mounting screws for wooden door or the UPVC door shown in the figure, suitable for home, office, hotel room door, indoor and outdoor. Package content: 1 door closer, Tip: When adjusting the force, you need to pull out the pin first, Then use a hex wrench to rotate the tail and align it with the corresponding hole, Finally insert the pin.