All steel design attracts peanut loving Woodpeckers, Blue Jays, Chickadees and Nuthatches. Large top opening for easy fill. Large capacity measures 12" tall x 7" diameter. Can be used for suet balls in winter. In spring, can be stuffed with nesting material. Locking lid mechanism. Disassembles easily for easy for clean. This feeder works well with our Classic Pole System that keeps squirrels off your feeder.