Tomahawk Model E50 is an excluder for squirrels, rats and similar size animals. Tomahawk excluders are designed to let animals remove themselves from unwanted areas. Excluders have mounting wings which allow them to be attached directly over the animals entry/exit point. The one way door lets animals exit and prevents them from entering. This excluder measures 5 x 5 x 12" and is designed to fit over 5 x 5" or smaller openings. It is constructed of heavy duty 1/2" x 1" - 14 gauge wire mesh.