The 32D is designed is for adapting a plumbizer to a mast arm or pedestrian pole by bolting to a surface where there is not a welded 1 ½” threaded hub to accept the 45B.  It is attached with two straps 1 1/2” wide and come 40” long for field cutting to the appropriate length.  The straps also have holes for a grounding bolt to be drilled and tapped to maintain the NEC ground.  (Strapping to a painted surface is not an NEC ground).