Little Giant Plastic Feeder Base is specially designed for smaller birds or baby chicks with its narrow channel structure. It is constructed of heavy-duty polystyrene which guarantees good quality and durability It comes in red color to attract birds easily. Its screw-on design is easy to attach to let you provide a gravity-feeder to smaller birds without any hassle. It is compatible with Little Giant 1-qt. Screw-On Feeder model no. 690 (sold separately). Product has 1 qt. capacity and it measures 4 in. diameter by 1.25 in. high.