Stokes Select 24-Inch Metal Clamp-On Deck Hook for Bird Feeder (38015) Metal clamp-on deck hooks is made from durable steel construction and weather-resistant finish. 24-inch metal clamp-on deck clamps onto horizontal railings up to 2 inches thick. Hand knob makes installation easy. Hang bird feeders, hanging flower baskets, lanterns and other decorative items from the hook. Clamp-on hook holds up to 15 pounds. Long extended arm hangs feeder away from railings to keep the deck clean.