Simply lock the support arm to the desired width， hang the planter， then fill with your favorite flowers or herbs. No tools， mounting hardware or drilling required. A hidden adjustable support bar keeps planters level. Not suitable for round railings. This convenient self-watering deck railing planter installs in seconds Having a dual planting area will bring 360 degrees of color and beauty to your deck， balcony and fence Each side holds 6 quarts of potting mix; 12 quarts total Can adjust to fit railings from 1in to 5in wide Plastic Made in USA Your security is our number one concern