Galvanized steel plate with tan finish.

Diameter of the opening: 1.25"

Can be placed over the opening of a Nuthatch nesting box.

Can also be used on a Chickadee 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 :

Red-breasted Nuthatch

Black-capped Chickadee

House Wren

Tufted Titmouse

House Sparrow

Prothonotary Warbler

Will exclude :

European Starling

Great Crested Flycatcher

Eastern and Western Bluebird

Tree Swallow

Carolina Wren

White-breasted Nuthatch