Handcrafted from solid pine this is the decorative solution to your mosquito problem or bats in need. Inside dimensions are 13" tall, 7 1/2" wide and 1 3/8" depth. Stainless Steel screws used to last the lifetime of your bathouse and the plastic meshing lining the inside of the front and back provides a weather resistant and safe way for your bats to climb and maneuver. All pre stained options are also pretreated to be weather, mildew and mold resistant.