Durable resin construction is maintenance-free, easy to clean, and UV-protected for fade resistance, giving you peace of mind Knockout drainage gives you the flexibility to either keep it sealed for indoor use to prevent leaks or provide adequate drainage for outdoor use Fits securely on flat railings 3.75" or 5.75" wide Capacity: 2 Gallon / Size: 12 in. Top width x 12 in. Bottom width x 9 in. Height x 12 in. Length