Prevents squirrels from widening the nest entrance.Provides extra protection from squirrels that like to enlarge the entrance hole and occupy a bird house.
Available with holes in the following diameters: 1″, 1-1/8″, 1-1/4″, 1-1/2″, 1-9/16″, 2-1/4″, 2-1/2″ and 3″.