The Squirrel Buster Legacy is a great mid-sized squirrel proof feeder. These feeders are built like tanks and have a spring loaded function that closes off the seed when a squirrel jumps on. Feeder measures 5-1/2 x 24 inches tall with the built-in hanger Holds ~2.5 pounds of seed or 1.5 quarts Here are some things to check/implement with your Squirrel Legacy Feeder to make it truly squirrel-proof for adult red and gray squirrels (please note that juvenile red squirrels and chipmunks can sometimes access seed due to their light weight): 1) Observe the manufacturer's stated installation clearances, e.g. install the feeder with 18" of clearance between top of feeder and the branch it is hanging on, 18" of clearance from launching points below the feeder, and 18" radius of clearance around the sides of the feeder; 2) Don't exceed the maximum level of seed as indicated by the bottom of the yellow center post cap, otherwise the shroud will not be able to close properly; and 3) Make sure the negative grip tube is in place on the hanging wire right against the top of the feeder to prevent squirrels from hanging by their hind legs from the wire. DISCLAIMER: This feeder will NOT deter Grackles, Starlings, juvenile Red/Douglas/Flying Squirrels, Chipmunks, Possums, Bears, Deer, or Raccoons. Please bring your feeder in at night to prevent night visitors from emptying and destroying your feeder.