Abstract: A connecting arrangement for connecting together a pair of orthogonally arranged profile bars a first one of which (1) is arranged with one of its ends adjacent the side of a second bar (2). A groove connecting member (4) is slidably retained in an undercut longitudinal groove (8) contained in the second profile bar, and an end connecting member (3) is slidably mounted in the groove intermediate the groove connecting member and the adjacent end of the first profile bar. First screws (6) fasten the end connecting member to the adjacent end of the first profile bar, and second screws (5) fasten the groove connecting member to the end connecting member, thereby to connect together the bars. Locator projections (11) on the end connecting member serve to properly position it relative to the first profile bar.