Yet another miracle from Woodlink's Coppertop series. Laser etched, pre-drilled for mounting and an ornithologically correct 1.125 in. entry/exit hole. This little beauty boasts no perch to keep out unwanted birds such as sparrows. A gap at the top of the home underneath the roof helps keep it ventilated, while a small hole in the center of the base allows any water that may collect to drain from the nest. The 0.875 in. thick wooden construction offers insulation for nesting wrens and chickadees and the side panel lifts for easy cleaning. A true winner!