A set of elements for forming corners joining profiles comprising flat elements insertable into chambers of profiles, wherein the set has at least one pair of flat elements (10, 20) of two arms, of which one is a basic flat element (10), and the other is an auxiliary flat element (20), which are setable up into two types of corner joints, wherein the pair of flat elements (10, 20) is connected together by means of at least one strutting element (30, 40, 50), whose tongues are inserted in mounting openings of the basic flat element (10) and openings of the auxiliary flat element (20), whereas spacing and size of the mounting openings of the basic flat element (10) and the auxiliary flat element (20), in which the tongues of the strutting elements (30, 40, 50) are inserted on a right surface of the basic flat element (10) and the auxiliary flat element (20) are mirror reflection of spacing and size of the mounting openings in which the tongues of the strutting elements (30, 40, 50) are placed on a left surface of the basic flat element (10) and the auxiliary flat element (20).
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