Tranquil Décor Real Basalt columns have an unmatched simple beauty. Perfect for creating a bubbling feature in a landscape or indoors. The Polished Side Basalt Kit is 39″ tall and has an approximate 14″-16″ diameter. Kit includes, basalt column, basin, pump & light ring. These polished stones make exceptional show pieces for high-end residential or commercial settings. Awesome display – running or not! These polished units make exceptional show pieces for high-end residential or commercial settings. Average diameter on these columns is 14″ to 16″. Awesome display – running or not! These stones are core drilled with 1 1/4″ hole through the column and the end recessed with a larger hole to house optional light ring.