This 6-pack of black rectangular railing planter boxes features adjustable mounting hooks, a removable water-holding tray, and multi-directional drainage holes. Designed to fit most balcony railings, they are ideal for growing flowers, herbs, and vegetables on patios, decks, and windowsills. | Oumilen | | Railing Planter Boxes 6-Pack, Black Rectangular Window Flower Boxes with Adjustable Hooks & Removable Tray for Balcony | Best Buy