With this Adjustable Railing Planter you can now beautify your decks， fences， railings， and sign post. Lock the support arm to the desired width， hang and you are done. There are no tools， mounting hardware， or drilling required. These are ideal for wood or metal railings. Fits on any sized deck or fence railing from 1in to 4in wide not tools required Works on chain link， wrought iron， composite， and standard wooden rails Planter arms are adjustable and lower stabilizing Arm keeps planter perfectly level， regardless of fit Water reservoir holds 6 cups of water with auto-overflow Hidden tray separates plants from reservoir with slits to allow only the roots to reach the water reservoir below avoiding root rot Plastic Made in USA Your security is our number one concern