The Tomahawk E100 is a one way door for raccoon, skunk or similar size animals. It measures 20"L x 10"W x 10"H is size. Tomahawk's one way doors have wings to attached the device over the opening, forcing the animal through the one way door. Once they go out through the door they can't get access back in. This model will work for raccoons but for raccoons we recommend the E100CG.