Abstract: A kit or system of mounting tubes having various lengths that can be selected from to provide a single, one-piece device to fill the gap and provide the requisite support and stability between an electrical device or structural fixture and a mounting box (for example, junction box) is described. The mounting tubes are easy to install and can be used with any conventional components (for example, electrical devices, screws, fixtures). The mounting tubes can prevent wobbly fixtures or electrical devices, can reduce likelihood of electrical shock or other injury, and can reduce the likelihood of fires due to electrical failures caused by faulty installation. The mounting tubes can provide continuous grounding.