The Great Eight offers the long-lasting S&K design that you"ve seen so often, It is based on S&K"s Best Purple Martin House, It offers 8 compartments for a full-sized martin colony, The nesting area is textured , has a water dam, and shaped to allow quick water drainage, It"s 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), 8 Large compartments 6""x 9"", Entry Doors are Starling Resistant, The G8 is EXPANDABLE to include multiple floors by adding additional houses, SKU: SKM008