BuyGoe Heavy Duty Deck Mount Umbrella Holder, Enhanced and Fully Welded Steel Patio Umbrella Base up to 2'' Poles, Outdoor Umbrella Light Monitor Flag Stand for Floor, Balcony, Decks, Docks

["This umbrella holder is heavy-duty alloy steel with professional anti-rust coating for ultimate outdoor durability and stability","At the joints, we have added four triangular plates and fully welded to ensure maximum durability and long-term reliability","Enlarged 7.1\" x 7.1\" base plate provides a rock-solid foundation to ensure the umbrella less prone to tipping over","Upgrade#1) - Use square tuber which has two contact surfaces with your umbrella pole and firmly grasps it","Upgrade#2 - We used a long iron card to expand the contact surface with the pole, so that it can be fixed most firmly","Fit pole diameter 1\"-1.7\", by removing the long card inside, it fits max 2 inch"]