A stable equipment system for e.g. pig pens and boxes comprises a U-shaped edge section (3), the longitudinal members (9) of which have a bending (10) close to their free edges (11). Thereby, a line of contact may be formed between edges (11) and surface (12) of wall or gate elements (2) and with filler elements in the sections (3), whereby gaping openings, which may give rise to dirt deposits and bacterial growth, are avoided. A better stable hygiene is thereby achieved.