EasyPro Basalt Fountain KitComplete kit for easy, professional results! Tranquil Dcor Real Basalt columns have unmatched simple beauty. Perfect for creating a bubbling feature in a landscape or indoors, these columns will provide years of enjoyment. Each column is core drilled with 1 1 4 (32mm) hole from end to end, the last 1 1 2 is enlarged to 1 3 8 (37mm) to house optional light ring. Natural cut sides with polished end make for a beautiful display even if the pump is off.