Clamp-On Lantern Arms Our contemporary lanterns can be attached to 5 1/4" or 6" concrete poles using the hardware listed. A series of gaskets control dust and moisture invasion that normally affects multi-purpose fixtures. The fixture can be mounted as a single or as opposing doubles, using single or double clamps, which clamp to the concrete poles using all stainless steel mounting hardware. Call for ballasting and lamp options (extra).