This balcony planter helps you make the most of your porch or patio living space, and lets you grow a mini garden in an elevated space. Compression design fits rail size 3-3/4" or 5-1/2" wide, and also works on widths slightly smaller (3" up to 3-3/4" or 4-3/4" up to 5-1/2"). Planter was designed to maximize inside growing space and features a tiered bottom design allowing dirt and roots to grow strong and deep. The planter features a smooth texture with matte finish. Made of durable resin, this planter is UV-stablized to prevent fading and cracking and ensures long-lasting use. Use on patio, mailbox post, balcony, fence or deck railing.