Purple Martins are attracted to multiple apartments to establish colonies. This house has eight "apartments". Each is separated for territorial rights to ensure the survival of the young. Wooden floors provide secure footing. Slips over 2" pipe or attached adapter for flush mount. Opens on 4 sides for easy cleaning. 18" H x 17-1/2" W x 17-1/2" D. Please note: Due to excessive air freight charges, this item will be shipped ground freight.