Heartwood Eastern Bluebird Joy Box New Arrival Outer diameter of flange is

Outer diameter of flange is 1-1/2" and inner diameter of flange is 1-1/4"

Capacity: 8 gourds (not included)

It is just what the name implies

Form a martin colony in your own backyard or add to your existing one with the Purple Martin SuperGourd Rack System without Gourds

Weight: 3 lb

Heartwood Eastern Bluebird Joy Box New Arrival Outer diameter of flange isThe Heartwood Eastern Bluebird Joy Box has a clean and simple design with hole opening and interior sizing specific for the Eastern Bluebird. The slanted roof provides a generous overhang, to protect the 1_1 2" diameter entrance hole from the elements. At the top of the frame ventilation holes are provided to help regulate interior temperature, and slots at the bottom provide drainage to keep everyone warm and dry. Maintenance is a breeze with the