Abstract: The present invention relates to a system for the frameless fixation of an insulating glass unit having two panes connected to each other by a rim connection having a groove in which a fixation element engages. The rim connection of the insulating glass unit consists of a preferably metallic spacer profile which is located between two panes that are essentially parallel to each other. On the outer face of the spacer profile a sealing matter, usually made of silicon, is placed, which assures a constant connection of the two panes, on the one hand, and an air-tight or gas-tight closing of the insulating glass unit, on the other hand. A groove is formed in this sealing matter belonging to the rim connection, on the outer face of the insulating glass unit. When the insulating glass unit has been mounted, the groove is advantageously not visible for an observer, since it is covered by the sealing matter as well as by the spacer profile.