The Chicken Treat Roller is a specially made cylinder made to dispense meal worms and other treats to your chickens, as they turn the The Chicken Treat Roller over and over. Stimulating fun for the whole flock! Simply unscrew the cap, fill with meal worms, screw the cap back on, and give it to the birds! Chicken Treat Roller is about 6-inches long and 2.25-inches in diameter.