Available in three standard sizes, these high-quality cable distribution rings can be used in distribution cabinets, closets and other areas where wires and cables must be routed and secured. D-rings can be used on cable terminals, ceilings, walls, backboards and other surfaces. They are constructed of strong, die-cast aluminum. Smooth, rounded D-ring edges prevent damage to wire and cable insulation and jackets. Mounting hardware is not included.