In addition to keeping out squirrels, this cage has the added benefit of keeping out grackles, starlings, and cowbirds (birds that sometimes dominant feeders and intimidate other birds).  The downside is that it will also exclude cardinals, blue jays, the hairy and red-bellied woodpecker, and mourning doves.  But it does give goldfinch, house finch, nuthatches, pine siskins, chickadees, sparrows, and other small birds a place to feed where they don't have to compete with some of the larger more aggressive species. This cage does not include a feeder.  Use with the Small Antique Brass Seed Tube.  Use the Wire Cage 19-1/2 x 12 for larger feeders. If your goal is just to stop squirrels and you aren't having any issues with grackles or starlings, we recommend one of the other squirrel proof options like the Hanging Cylinder Feeder, Pole systems with a baffle, or the Squirrel Buster Plus.