Perky-Pet Squirrel-Proof Metal Bird Feeder. 4-port, 4 lb. capacity feeder with a weight-activated seed protection mechanism that closes the seed ports when a squirrel tries to eat. Plus, the 18" clearance on all sides helps prevent squirrels from reaching the seed. The Sure-Lock cap and metal frame deter squirrels from lifting the lid or chewing around the ports. This easy to hang feeder offers 5 In-1 benefits with its Flexports that are 4X more shake resistant than standard ports, reducing seed waste and mess. Birds can feed at an optimal position outside the port for better visibility and safety, and the ladder-style perch accommodates a variety of bird sizes. To be 100% squirrel-proof hang the feeder with at least 18 inches of clearance on all sides.