Our revolutionary design means you can enjoy tremendous bird activity at your feeder—without the interference of squirrels! Handy roof provides shelter to your feathered visitors while keeping valuable seed dry. Designed specifically for black oil sunflower seed, the patented Squirrel-Blocker™ screen system allows only birds to feed because squirrels simply cannot pick up the seed through it. Constructed of squirrel-resistant nylon resin, the tray has built-in drainage and a 1" post-mount capability. Secure screen in place on top of seed and leave the rest to the birds.