Abstract: An extendible brace or dunnage bar for stabilizing cargo items within the interior of a cargo transport vehicle, the invention provides a simple, reliable and inexpensive device capable of rapid positioning relative to an object which is to be braced against movement. In a first embodiment, an elongate bar is received within a rectangular casing and is provided with spur-like elements on the free end of the bar for engaging an interior wall of a freight car. The rectangular casing is provided with a threaded collar which receives a threaded rod displaceable longitudinally of the elongate bar to cause extension or contraction of the brace on rotation of the rod. The rod terminates at its free end with a freely mounted foot plate adapted to engage a freight car wall opposite the first-mentioned wall or a surface of a cargo item itself, the rod being rotated to mount the brace therebetween through use of a tool such as a wrench in engagement with a nut permanently joined to the rod adjacent to the foot plate.