A mounting bar has a body portion and a mounting slot extending at least part way through the body portion near an end thereof. The mounting slot is defined by a first radius extending through the body portion. The slot is further defined by a bottom surface substantially tangent to the first radius, the bottom surface extending toward the end of the body portion. A leading surface, closer to the end of the body portion than the first radius, extends from the bottom surface of the slot to an outside surface of the body portion. A clamping mechanism is provided and is operable to secure the mounting bar to another support that is positioned in the mounting slot.