Cedar dove nesting boxes are hand crafted using rough sawn Western red cedar from sustainable forests in Oregon. Designed specifically for doves. 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.