Galvanized steel plate with tan finish

Diameter of the opening: 1"

Can be placed over the opening of a wren nesting box so that squirrels and woodpeckers cannot enlarge the opening and exclude larger bird species. 

Dimensions of plate: 2'' x 2''

Will work for :

House Wren

Will exclude :

European Starling

Great Crested Flycatcher

Eastern and Western Bluebird

Tree Swallow

Carolina Wren

Red-breasted Nuthatch

White-breasted Nuthatch

Tufted Titmouse

House Sparrow

Prothonotary Warbler

Black-capped Chickadee