This large, traditional bluebird house is constructed of natural cedar. The front of the house swings open for easy cleanout, and is easily locked back into place. A sloping roof and drainage holes ensure that nests don't get wet. Ventilation gaps at the top of the house prevent the nest and its inhabitants from getting overheated. A thick wooden predator guard over the hole protects bluebirds and their fledglings from other animals who might otherwise enlarge the hole. All screw construction means that taking this house apart is a snap. Measures 7.125" L x 7" D x 15" H with a 1 9/16" hole. Made in the USA.