If the balcony is has to be securt on the sides, then this corner connection is required. It ha to be plugged into the already installed telescopic rod which is located in the cirber of the balcony and screwed tied. This connection is only for right-angled (90°) corners. If you want to build an enclosure in the garden, you can also use this framework system. We are happy to advise you on the selection of the required parts.