Abstract: A structural framework system for the construction of exhibition display stands and the like makes use of a beam extrusions having dovetail shaped edge formations which enable panel frames to be hung therefrom and locked in position by virtue of coupling frames incorporating therein a locking element which can be retracted into a recess of the coupling frame for initial location of the coupling frame relative to a beam and can then be moved to project from the recess and to clamp the beam dovetail by insertion of actuating pins into bores provide in the coupling frame and communicating with the recess. A beam end fitting enables a beam to be secured to a transversely-extending second beam by a similar process and a 4-way node fitting enable nodes to be formed at the intersection of a plurality of orthogonal beams. A leg length adjustment provides for the adjustment of the lengths of structural support legs.