Railing Flower Box Holder Plants Hanging Basket Adjustable Flower Box Holder White Color The inside diameter of the railing is 2.17", if you need other size, please contact us. If not, we will sent the 2.17" railing to you. Thanks Flat iron series window and deck planter Railing flower box holder, powder coated finish Material: metal Dimension: 19.6"x7.8"x4.7"