This hand-crafted cedar bluebird house is field tested and approved by the National Audubon Society and features a Coppertop roof. Built to Audubon specifications, it features a 1-9/16" hole and is fitted with a predator guard. Each house has an education label and insert sheet to assist you in attracting bluebirds and other desired nesting birds to your backyard. Mount nest box approximately 4 feet to 5 feet high on an Audubon pole, baffled wood post or tree. Easy to clean.