Bloem MR1856-6 Modica Rail Planter, 18-Inch, Exotica, 6-Pack Water reservoir in bottom Groove sizes for a 2 x2, 2 x 4, or a 2 x 6 rail Center rail punch out holes allow you to secure and stabilize the planter with cable ties (not included) Available in a variety of sizes and colors Made in the USA