The Heavenly Haven offers housing for 10 Purple Martin families! But thats just the beginning. Comes with porches landing and take-off area and nesting area that allow quick drainage - keeping the nest dry. No tools required during construction! Its made for the RP19 (1.9 dia round Pole) a SP2 (2 Square Pole) The Ezlift 2 3/8 pole (2 3/8 dia round pole) or the Triangle Poles (Quad-Tel or Tri-Tel Pole). RTFAS (Round - Triangle Floor Adapter Set) is Sold Separately. HH is constructed of 100% UV Protected Injected Molded Polypropylene Copolymer Plastic. 10 Large compartments: 9x 9. Entry Doors are Starling Resistant. The HH is EXPANDABLE to include multiple floors by adding additional houses.