CobraCo UNCB12-B Canterbury 12-Inch Black Multi-Purpose Planter Fits most wooden deck railings 3-by-6-Inch, as well as most 4-Inchx4-Inch and 6-Inchx6-Inch posts Textured black finish The multi-purpose planter measures 12-inch wide and 7-1/4-inch high Part of the Canterbury Collection. Includes coco liner