Invite a few bluebird families to roost in your yard by placing these Nature's Way Cedar Traditional Bluebird Houses in it. These melodious birds readily nest in manmade cavities, and these 4 durable, cedar pieces sport a bevy of features that keep the birds protected. A 1.5" diameter entry hole rests on the front of each shelter, surrounded by a significant, 1" thick piece of cedar. This cleverly extends each entry, forming a barrier which discourages squirrels and other predators from reaching into the nest cavity. A black, lapped roof overhangs the entries, protecting the nests from rain, and a gap beneath each helps ventilate the shelter. Routed lines slightly above the base hold a wire mesh screen, which acts as a nest lift to prevent blowfly infestations. The front panels raise upward to check the nests, and skerfs here help nestlings reach the holes when ready to exit. Attach each shelter to a post or pole using a mounting bracket, or affix their extended back panels to a fence or wall for a different look. The durable, cedar construction provides hardiness and longevity to the items, as it naturally repels insects and rot, and will age to a striking gray hue over time. Turn your yard into a bird sanctuary with these Cedar Traditional Bluebird Houses. Three year warranty. Note: This case pack contains 4 of the Nature's Way Cedar Traditional Bluebird Houses. Opening: 1.5" dia. each Dimensions: 8"L x 5.5"W x 12"H each Mounting: pole or post mount Construction: cedar, metal Mfg. Warranty: 3 year warranty