Better than metal nests, and costs less! The Little Giant Single Open 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. Hen-friendly design features an open back and top to allow better ventilation and easier access to eggs in some coops. The front edge helps prevent loss of bedding and the slightly graded floor leads to a back drainage hole. Mounts securely on wall with slide-type screw holes or sits squarely on a shelf. 17 inch long by 11.9 inch wide by 11.9 inch high, space-saving modular layout can be mounted vertically or side by side on 16 inch on-center studs.