Specifications: Material: Space aluminum Size: Base size: 42*180mm Arm length: 165mm Electric arm fixing device size: 39mm Screw length: 15mm Maximum door opening angle: 150 Color: Black Package Included: 1 x Door Closer 5 x Screws 1 x Allen Wrench Specification: Door weight 30kg, maximum opening angle 150. Material: High quality aluminum alloy, anti-rust and durable, spring-loaded, adjustable tension for slow or fast closing. Note: Suitable for left and right door opening. The door should be as flush as possible with the door frame (height difference should be less than 5cm). Function: For wooden and aluminum doors in family rooms, offices, and hotels. Easy to install. Installation: In the middle position of the wooden door or aluminum alloy door frame, fix it with a screw. Adjustment Method: Insert the hex socket wrench into the top hex screw hole and turn it. Set the required force in the six adjustment holes according to the weight of the inserted door.