Protects bird feeders and feeding stations from the ravages of squirrels. Large diameter,super smooth, slippery dome beats the most determined critters. Adaptors supplied to fit three diameters of poles, 12mm, 22mm and 25.5mm. Can be used in conjunction with the following Gardman accessories, Heavy duty feeder poles, single and twin shepherd's hooks, premium feeding station kit, deluxe feeding station kit. Product Code:GARA01158