Apollo Adjustable Railing Planter, Double-Sided (Green, 16 inches) The perfect rail planters that can be placed just about anywhere Beautify decks, fences, railings and sign posts with these ingenious adjustable planters Lock the support arm to the desired width, hang and finished - no tools, mounting hardware or drilling required Secure center support arm adjusts to varying widths, from 1 inch up to 5 inches wide Other features include a 3/4 inch reservoir to hold excess water to reduce watering and an included soil tray