The invention relates to a system of supporting bars on which items to be presented are hung, directly or indirectly, in goods and services establishments, comprising essentially a support bar (1) which has an insert end (10) at the very front. Said insert end (10) can be inserted into an axial entrance opening in a receptacle (2) or directly into an entrance opening in a support structure and locked in place. The receptacle (2) is fixed in an opening in the support structure. The insert end (10) is provided with a hooked contour and the inserted support bar (1) is locked in place in various ways. According to a first variant, the hooked contour engages from behind in a relief cut into the insert end (10), the support bar (1) having first been lifted at the opposite end of the bar to the insert end (2) and aligned whilst being pushed into the entrance opening. According to a second variant, a spring element (5) located in the receptacle (2) locks into the hooked contour. According to a third variant, an exit opening is provided in the support structure where the upper wall edge engages in the hooked contour after the moving process described in the first variant. The support bar (1) itself can be used for hanging up items or alternatively, one or several support bars (1) can be used to maintain an element for supporting goods. The system of supporting bars creates new ways of presenting and arranging products and services for shop and exhibition layouts.