Patio Umbrella Holder, Heavy Duty Metal Deck Umbrella Clamp Mount Base for Outdoor Railing Post, Balcony, Courtyard, Fences (Corner Mount) Flexible application - The mount accommodates umbrella pole between 0.79 inches and 2.1 inches in diameter. By tightening the 4 fixed knobs to fix the hole diameter. No more stand to fill with sand or weigh down with weights Easy to install - Includes all necessary accessories. Just assemble in stages and screw down tightly to complete the installation Premium Quality -The Sun Umbrella Base is made of heavy duty stainless steel material with high-temperature powder coating, waterproof and rustproof Stable and Durable - The deck railing umbrella holder is characterized by a robust, fully welded construction, significantly enhancing its durability and resistance to breakage Space Saving - Keep your outdoor area cool and shaded without crowding your guests or taking up precious floor space with the innovative new Umbrella Holder by , which could be used for Deck, Pool Deck, Benches, Bleachers, Tailgates, Boats, Poles, Fences