Custom Handmade EASTERN RED CEDAR Log Cabin Bird House Quality Built in USA. There is two screws on the bottom for clean out. Eastern red cedar not treated with any chemicals, the cedar will last for years untreated. Eastern red cedar is the choice wood for any outdoor use, it's rot resistant, bug resistant, and smells really good! The inside of the house measures 5" X 5" and the hole is 6" to the floor and measures 1 1/2" in diameter. This house will accommodate small birds such as blue birds and many others. It has venting on the top of the sidewalls plus some small gaps occasionally in between the logs, this helps for incubation to give your birds the best chance. It has non predator entrance. I have multiple houses that are all basically the same as the pictured house, so the one in the picture may not be the exact house you get but it will look just like it.