Tranquil Decor 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 in. hole from end to end, the last 1-1/2 in. is enlarged to 1-3/8 in. to house optional light ring. Basalts can be used individually or in sets. Three column sets are available. Natural cut sides with polished end make for a beautiful display even if the pump is off.