This is the ultimate Bluebird bird house. Made from recycled poly lumber. Stainless steel screws. Opening side doors. . Viewing door opens to a plexy glass viewing window. Raised screen floor to reduce blowfly infestations. Front wall screen helps chicks climbing to the entrance hole. Predator resistant 1 1/2 inch entrance hole. Overhang roof, vents and drainage holes keep nest dry and cool. Comes with mounting screws.. Measures approximately 11 inches long by 8 1/2 inches wide by 12 5/8 inches high.