This sleeve is intended to support medium to larger houses and feeders without the need or expense of a pedestal. It will sit on top of a standard wooden 4″ X 4″ post. Scrollwork detail and 11.5″ X 16″ platform will make the birdhouse more spectacular than the normal post mount. Exterior grade ply-board construction. Non-toxic outdoors paints. Birdhouse not included. Item Dimensions: 6″ H X 16.5″ D X 11″ W.