Interesting and fun experiment: when squirrels or raccoons try to climb on the perch to eat food, the devices to spring begin to stretch, avoiding animals, closing, preventing them from climbing, making interesting movements to entertain you Good size: the spring device is about 2.2 inches in diameter , approximately 25 inches in length and can be installed on different styles of hooks without adjustment. Just install the spring on the top of the support rod, simple and convenient Provide a stable feeding place for birds: the metal spring device has good elasticity, can stretch long enough to provide enough distance between the bird feeder and to keep squirrels for birds to eat the food, creating a chicken coop for birds to feed on. What you can get: You will get 3 outdoor bird feeder accessories, enough for you to choose and use, which will add more fun to your garden and life, and you can also share it with your friends Reliable material: our bird feeder is made of high quality