Bluebird Box House is made of insect and rot resistant premium cedar and stainless steel screws. This bird house features extra air vents, clean-out doors, elevated mesh floor, predator guard, and a 1.5 inch entry hole. This bluebird house can be pole or flush mounted, and includes a water-based protective stain. This Bluebird House comes with the predator guard installed for the Eastern Bluebird with hole size 1.5 inch. Included in the box is a predator guard for the Western or Mountain Bluebird with the hole size of 1.56 inch, that you can change out if you are in the Western U.S.