eaudacèCan hold door weights up to 40 kg - Pair of door closers (up to 20 kg - 1 door closer). (A) A door closer must be installed in the middle of the door (if only one door closer is to be installed); (B). The door and door frame must be kept in a horizontal plane and the drop must not exceed 3 mm. Adjustable tension - Adjust the door closing force - Insert the hex key and turn it clockwise or counterclockwise. If you want to use this product, there must be a door frame and the width of the door frame must be greater than 3 cm. Simple to install and supplied with all required fixings. Come with 2 door closers and hex keys and screws. Suitable for Different Types of Doors 2-Piece Automatic Door Closers, Silent Spring Door Closers, Adjustable Tension, Support up to 40 kg, Come with Hex Key and Screws It is spring-loaded with adjustable tension and can be used on left or right opening doors up to 40 kg. Features: Reduce buffer speed, protect your doors Auto to close the door, more convenient Reduce the noise caused by closing the door IMPORTANT NOTICE: 1..Adjustable Tension - Adjust the door closing force - Insert the hex key and turn it clockwise or counterclockwise. 2. A door closer must be installed in the middle of the door (if only one door closer is to be installed) 3. The door and door frame must be kept in a horizontal plane and the drop should not exceed 3MM. 4. If you want to use this product, there must be a door frame and the width of the door frame must be greater than 3cm. 5. If it is a heavy-duty door (weight ≤ 40 kg), you need to install two door closers, the best installation position is one from top to bottom, so that the door can be closed normally. What's Included: 2 x Door Closers 8 x Screws 2 x Hexagon Wrench Number of Products: 2 Pcs Color: Silver Size: As shown