Creating an ideal environment for purple martins, this natural woodhouse offers 12 hospitable nesting chambers for the communal,mosquito-eating bird (martins eat thousands of mosquitos every day).The durable, weather-resistant red-cedar construction iswell-ventilated to keep nest temperatures cool during summer months,while the guardrails prevent fledglings from falling, ensuring a safeand comfortable place to live for these acrobatic foes of flyinginsects. The tough wood house requires no finishing or maintenance(except for a quick and easy cleaning once a year). The rich redexterior will gradually acquire a soft silver patina over time due tonatural weathering process. The unit mounts atop a 11³4-inch diametergalvanized steel pole (included). Minimal assembly takes 10 minutes using a Phillipsscrewdriver. Includes hardware and instructions. 18" H x 16 3/4" W x19" L. (19 1/2 lbs.)