Solid Red Oak Portals are both decorative and functional, these are the same portals we use on all our birdhouses they act as a preditor guard and deterant for red squirrels. We ship them with 2 brass nails and instructions. Chickadee 1 1/8",Downy Woodpecker,Tufted Titmouse and Red Breasted Nuthatch 1 1/4",White Breasted Nuthatch 1 3/8",Eastern Bluebird,Tree Swallow, Violet Green Swallow 1 1/2". Don't Forget to Choose the Entrance Diameter! Availability: Usually ships in 2-3 business days. Replacement Portal RP01Regular price: $10.00On Sale for $9.00 OPTIONS: 1-1/8"1-1/4"1-3/8"1-1/2"1-9/16" Thank You for visiting Sassafras Hollow!