The PC mounting arm features a 2 3/8” (60 mm) round extruded-aluminum arm welded to the central pole adaptor. The mounting arm includes an extruded-aluminum decorative rod welded to the central pole adaptor and to the arm. The luminaire adaptor will accept a luminaire equipped with Lumec’s four-bolt mounting system. The aluminum central pole adaptor slip-fits 9” (229 mm) over a 4” (102 mm), 5” (127 mm) or 5 9/16” (141 mm) O.D. pole or tenon. Lumec3D: Online 3D Configurator