2 Piece Automatic Door Closer, Silent Spring Door Closer, Adjustable Tension, Max Weight 40kg, Comes with Hex Wrench and Screws. Suitable for doors up to 40 kg when using two closers (up to 20 kg with one closer). Install one closer in the center of the door when using a single unit. Ensure the door and door frame remain on a horizontal plane with a drop not exceeding 3 mm. Adjustable closing force via hex key – turn clockwise or counterclockwise to adjust tension. Requires a door frame with a width greater than 3 cm. Easy installation with all necessary hardware included – includes 2 door closers, hex keys, and screws. Spring-loaded design allows for left or right-handed door installations. For doors weighing up to 40 kg, use two closers installed in upper and lower positions for optimal performance.