This Barn birdhouse is made from cedar with Bolivian Bloodwood accents. Easy rear cleanout.  Post mount fits any 3 ½” square post.  Base is removable to flat mounting.  Includes starter kit nesting material.  Entrance hole size 1 ¼”.  Bird’s: Nuthatches, Downey Woodpeckers, Wrens, Titmouse or any smaller bird.