Abstract: Components for forming a drawer or other tray-like structure comprise hollow wall members, conveniently plastics extrusions, defining mortice sockets in their ends, and corner or front connecting members, conveniently plastics mouldings, having tenons engageable in said sockets and retained by triangular or similar detents which snap-engage with complementary apertures in walls of the sockets. The detents are carried on the free ends of resilient tongues, which free ends are directed away from the free ends of the tenons, and edge faces of the detents diverge away from their leading tips to a substantially broader abutment part which may include an undercut abutment face for greater security. Provision may be made for the tenons to be glued as well as or instead of being solely retained by the detents, of which the following is a specification.