Abstract: A load-bearing structural member (5, 6) comprising a least two hollow extrusions (12, 13) of light metal alloy each formed with two surfaces mated together with a layer of adhesive therebetween by relative linear movement of the extrusions in a single direction, the surfaces on one of the extrusions being formed on limbs (29) projecting therefrom and the angle between the mating surfaces and said direction being within the range 5.degree. to 15.degree., the surfaces on the other extrusion terminating in shoulders (21) to be approached by the tips of the limbs (29) and a gap (75) to ensure that the layer of adhesive always extends between the shoulders (21) and the tips (74).