The invention provides a structural dismantable joint assembly for joining a first to a second structural framework member, comprising a band clamp sized to embrace the first structural member and provided with a pair of alignable spaced-apart apertures near the ends thereof, the second framework member, being of hollow cross-section and having at least one end provided with two opposing holes, the ends of the band clamp being insertable into the second framework member between the holes, the apertures being in alignment with the holes, and a tightenable bolt unit configured for insertion through the opposing holes and the apertures, whereby on tightening of the bolt unit the ends of the band clamp are brought more closely together as result of pressure being applied by the opposing walls of the second framework member, the assembly being thereby fastened to hold the two framework members in selectable angled relationship to each other.