This nest is a great alternative to the metal nest box. The Little Giant Single Nesting Box is made of high-density, impact-resistant polyethylene that will not rust, rot, or corrode. The plastic surface is easy to keep clean and does not get as cold as metal. Amply sized, hen-friendly design features an entrance perch and ventilation holes for fresh air. The box floor is lower than the entrance, which helps prevent loss of bedding. Sloped roof prevents roosting. Mounts securely on wall with slide-type screw holes. 16.5 long by 15.88 wide by 19.75 high, space-saving modular layout can be mounted vertically or side by side on 16 on-center studs. Neutral gray color with black perch.