The unique shape of the home displays the mastery of the artists who hand craft each individual piece. Further treated with a high-quality polyurethane multi-coat finish to ensure longevity of the wood in the elements. The homes also come with pre-drilled drainage holes, removable hatch for cleaning, and hardware. The Ellipse is sure to be a wonderful addition to your backyard birding haven. Entrance hole dimensions are 1 1/8 inch, perfect for small cavity nesters.