Abstract: A support assembly is disclosed comprising an elongate member and a bracket.In order to fix the bracket to the elongate member in such a way that it cannot easily be dislodged from the member accidentally, the member is provided with a longitudinal channel and one or more intersecting transverse channels, and the bracket is provided with an angled element which lies in the channels at an intersection, and means (preferably a further angled element engaged in the intersection of a further longitudinal channel and transverse channel) to embrace the member to hold the angled element in the channels. Bracket extensions may be fitted to the brackets supporting shelving, cabinets, cupboards and the like.