Abstract: Mounting apparatus is disclosed for installations of tubing, pipes, cables and other rigid or flexible elongate elements. A first segment of the apparatus includes a pair of relatively flat, longitudinally extending rectangular members rigidly fastened together along a longitudinal edge of each to maintain a predetermined angle, nominally a right angle, between them. Additional segments, each constituting a flat longitudinally extending member substantially coextensive longitudinally with the others, are pivotally connected to adjacent segments along corresponding longitudinal edges, one of these members being pivotally connected at a longitudinal edge of one member of the pair for the first segment. In this way, the latter segment may be pivoted to position it at a selected angle to the first segment, with which it is connected to form an open or closed polygon which can receive and retain the tubing, pipes, cables or other rigid or flexible elongate elements when the mounting apparatus is in use.