A structural member (12, 14, 16) for coupling to a similar structural member for forming a framework, the structural member comprising an elongate channel having a web (30) and first and second sidewalls (32, 33), the first sidewall having a transversely extending slot (40) and the second sidewall having a complementary tab (42), wherein the slot and tab are transversely aligned and are positioned and adapted to respectively engage a tab and slot of a similar structural member to thereby couple the structural members together. The dimensions of rail (14) are such that it can interlock with the formations on the upright channels (52, 54). The projections (82, 84) are received snugly within the openings (72, 76) respectively. The projecting legs (88, 86) are received within the slots (70, 74) respectively. The lengths of the slots (80, 78) are such that the end of the rail (14) abuts or lies adjacent to the faces (62) of the upright channels (52, 54). This provides an interconnection of the rail (14) with the upper ends of the upright channels (52, 54).