The McKenzie Knotholes are unique base options. Meticulously cast, sculpted and stained to simulate real wood, these hollow bases work exceptionally well for a multitude of small mammals and birds. Constructed of semi-rigid foam, they come with backboards to be attached along with the needed hardware. Wire will penetrate the semi-rigid foam for easy anchoring of mounts. For extra security lock the wire in place with epoxy putty. Three sizes help you choose the one that is exactly right for your mount. Wood Ducks, squirrels, raccoons, and more will look right at home mounted on these knotholes.