The M12K Pioneer actually pioneered the aluminum Martin housing industry. In 1962, 28 of these houses were installed along the main thoroughfare in Griggsville, Illinois in a successful attempt to control and abundance of insects. With few changes, this is still the most popular house. 2 story, 12 compartment house with winter door stops, roof perch, and mounting bracket. Post not included.Use M12KP or will mount on a 1 1/4" to 1 5/16" outside diameter pipe.