Bluebird Box House is made of insect and rot resistant premium cedar and stainless steel screws. This house features extra air vents, clean-out doors, elevated mesh floor, predator guard, fledgling skerfs, and a 1 ½ inch entry hole. This bluebird house can be pole or flush mounted, and includes a water-based protective stain and Nature's Way Bird Products' exclusive 5 year warranty! The CWH3 Bluebird House comes with the predator guard installed for the Eastern Bluebird with hole size 1 1/2 inch.