Abstract: The invention relates to a system for holding elongated objects, which system comprises holder modules (1), each of which being provided with at least one seat (3) with an arched shape intended to receive an elongated object. The holder modules are provided with mutually co-operating coupling members (5a, 5b) for coupling together two holder modules with each other. A first coupling member comprises an elongated projection, which is tapered in its longitudinal direction and which has a dovetail shaped cross-sectional shape. A second coupling member comprises a groove (7) with a dovetail-shaped cross-sectional shape, which groove fits to the projection and is tapered in its longitudinal direction. The projection is insertable into the groove and displaceable to a locking engagement in the groove under gradual reduction of the play between the two holder modules when the projection is displaced into the groove.