Adorox Decorative Plastic Wedding Event Column Adjustable Height and Holds Flower Plate (66" in w/Lights - 1 Column) Plastic Roman Columns are the perfect touch to your wedding or special event. Center inserts of the Column have a 7" diameter. Each Column come with a bottom and top base measuring 12X12 inches. Columns are height adjustable and can be broken down very easily. Top flower plate has an inside measurement of 10x10 inches.