The Wren Chickadee Bird House is manufactured by from recycled western cedar. It features a 1-1 inch hole size located 2 inches above the floor of the house which keeps the nestlings safe. Ventilation openings in the roof, and drainage hole in the floor keep the nestlings dry and comfortable. Drilled nails holes make it easy. All you need is a hammer! The front of the house opens for careful observation, and cleaning in the Fall. Mount your Chickadee Nest Box at least 6 feet high on a fence or tree trunk.