Appropriate for wren, Black-capped chickadee, tufted titmouse, white breasted nuthatch, violet green swallow, bluebirds, tree swallows. Grooves in wood below entrance for young to use to exit. Easy clean out/good ventilation to use as functional garden accents. Both vertical sides open like doors. The right side has a clear plastic window inside the wood door, so you can peak into see the nest without disturbing the inhabitants. The left door easily opens for seasonal cleaning, a single pin can be twisted to unlock and swing the door open. To lock, simple twist the pin. Providing a nest box in your backyard will bring you seasons of enjoyment as you watch these beautiful birds raise their young. 14.75-inch x 6.75-inch x 9-inch. Stovall products feature all cedar construction, stainless steel and dichromate plated screws, washers, hooks and chains, hand sanded, assembled with screws, many products coated with wood protector which accents the wood grain and the natural warmth of cedar.