This 4-piece railing planter kit features rectangular self-watering black plastic flower boxes and 4 sets of adjustable black metal mounting brackets. The brackets offer 4 adjustable back depths to clamp most common balcony railings securely without drilling. The planter has an internal water reservoir and drainage system to maintain stable soil moisture and avoid overwatering. Made of durable weatherproof plastic, the pots resist sun fading and cold damage for year-round outdoor use. You can line up the 4 planters along the fence to create a vibrant floral display on balconies, patios or porches. | Oumilen | | 4-Pack Red Window Box Planters with Adjustable Black Railing Mount Brackets, Rectangular Self-Watering Flower Pots | Best Buy