Cedar dove nesting boxes are hand crafted using rough sawn Western red cedar. Designed for smaller sized doves yet many other species of birds will also use for nesting. Easy clean out without having to remove or adjust parts. Mounting screw and washer provided. Interior dimensions 3 3/4 in. at bottom, 9 1/2 in. at widest top, 5 1/2 in. tall, 5 in. deep, security rail 1 1/2 in. high. Exterior dimensions 13 in. wide, 6 1/2 in. tall, 5 1/2 in. deep. For highest nesting success mount in a protected yet accessible area such as under an eve of a building.