The top plate (2) has at least two holes (5,6) for fixture-screws. A profiled rail (1) protrudes from the top plate which is integrally shaped on the base (7) of the profiled rail and is bent at an angled formed between the surface of the top plate and the longitudinal extension of the profiled rail. Reinforcement gusset plates (3) between the top plate and the profiled rail are each angled outwards and are integrally formed on the side parts (10) of the profiled rail near the top plate side end of the profiled rail. Each gusset plate has an angled tab (4) which has a fixture screw hole (6) flush with one of the holes (5) in the top plate. The profiled rail has a C-shaped cross section and consists of a base (7), two side parts (8) at right angles to the base, and guide strips (9) bent at right angles inwards.
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