It is a flat metallic element with a surface, which is of a first outer edge to one of the first outer edge opposite second outer edge extends, described. The is connected to the first outer edge region of the metal element forms a first edge region and which is attached to the second outer edge region of the metal element forms a second edge region. Both edge areas by a central region are connected to one another, wherein at least in one of the side regions completely bordered at least one opening is formed, whose border for a part of this edge region and to the other part of the central region is formed. The central region comprises at least two sections, each of which consists of two outwardly disposed part sections and a central part section located between these consist. The outwardly disposed part sections are, for generating the opening with respect to the central section is folded. The sections form a part of the border of the opening and of the central region, including the sections in one piece with the two edge regions of the metal element.
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