Includes drainage holes and a water reservoir to help protect against overwatering.Compression fit design ensures a secure fit on 2", 3.5", and 5.5" width rails. For smaller rails secure with zip ties underneath planter for added stability (*zip ties not included).Capacity: 1.5 Gallons / Size: 12 in. Top width x 12 in. Bottom width x 8.75 in. Height x 12 in. LengthCapacity: 4 Gallons / Size: 26 in. Top width x 26 in. Bottom width x 8.75 in. Height x 14 in. LengthProudly made in the USA.