The connecting kit for hollow sections is for use on window or door structures. A corner piece has notches on its legs which correspond to noses and engage to form at the same time pivoting points for the rocker arms (3, 4). The light of the clear gap of the hollow section is reduced near the mitre ends. When the mitred end is pushed over the leg with the respective arms in place, first ends (7, or 8) are pressed downwards by the reduced clear profile and by an indent provided near the section end. When the indents pass the other end of the rocker arm, lips are pressed down and kept in position by the indent.
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