These transition boxes are constructed of black ABS with a haircel finish. They are all slightly more than 5" deep and at the opening they are 1/4" larger than the nominal size. The flange corners and all edges are rounded to avoid sharp points.
Boxes can come standard with no rings pre-attached, therefore hose ring(s) will need to be purchased. These boxes can also be ordered with one hose ring attached at the factory - on the back, side, or end of the box.