The first and still the best to protect your Hummingbird and Oriole feeder from ants and other crawling insects. Insert between hanger and feeder and fill with 6 oz. of water, providing a barrier to crawling pests. It's easily mounted with two open hangers (each 5/8" inside diameter), plated for excellent weather protection. The TRAP-IT™ is molded of one piece weather resistant plastic. Dimensions: 1.75" H (plus hooks) x 3" diameter. By Wildlife Accessories.