Chris-Wang 1Pcs Over the Rail Hanging Flower Pot Holder Round Metal Wire Balcony Flowerpot Holder Railings Wall Style(Black) This pot holder is made out of steel wire that is welded into shape for extra strength, and it has a powder coated black finish which helps it standup to the harsh weather outdoors. Display your potted plants in a surprising new way with the flower pot holder. This holder mounts to a wall, square deck rail, or round deck rail with ease. Add a 6-inch diameter pot to the holder and plant it with your favorite flowers or herbs. Fit on any 2-inch deck railing. Dimension: bottom dia. 16cm; upper dia. 20cm; total high 21cm(available high 10cm); hook fit on 5.5cm deck railing.