A connection assembly 10 usable for interconnecting two extruded square section aluminium elongate members 12. The assembly 10 includes a frame member 18 which locates in an end of the elongate member 12, with a pair of engagement members 28, 38 extending from the elongate member 12. A second engagement member 38 is movable relative to the first engagement member 28 so as to grip in a channel 14 on the other of the elongate members 12 to hold the elongate members 12 together. The second engagement member 38 is movable by a pivotally mounted handle 52 which extends outwardly from the elongate member 12 when the assembly 10 is in an unlocked condition, but locates substantially wholly within a channel 14 when the assembly 10 is in a locked condition.