Holds door weights up to 40kg - Pair of door closers (up to 20kg - 1 door closer). (A) A door closer must be fitted in the centre of the door (if fitted); (B) The door and door frame should be kept in a horizontal plane and the drop should not exceed 3mm. Adjustable tension - Adjust the closing force of the door - Insert the Allen key and turn clockwise or anti-clockwise. If you want to use this product, a door frame must be present and the width of the door frame must be greater than 3cm. Easy to install and supplied with all necessary fixings. 2 door closers are included, as well as Allen keys and screws. Suitable for various door types.