Openings in the middle section of the wire mesh align with the peanut ports, providing birds access to the food. When a squirrel climbs onto the feeder, its weight automatically forces the wire mesh down, closing access to the ports. This action is weight adjustable to also help control unwanted large birds. Woodpecker friendly design.
Remember it's the squirrel's weight that triggers the closing mechanism. If a squirrel can reach over from a nearby foothold and avoid placing weight on the feeder, then the squirrel will have access to the seed ports! Allow for at least 18 inches of clearance around the feeder. This will force the squirrel to climb onto the feeder, thus triggering the closing mechanism.
Capacity: 3/4 quart of shelled peanuts or wild bird food nuggets, such as suet nuggets. Dimensions: 18" H (plus 9" hanger) x 4.75" diameter. From Brome Bird Care.