BuyGoe 2 PCSHeavy-Duty Patio Umbrella Holder, Fits Umbrellas up to 2", Adjustable Deck Umbrella Mount Outdoor Mounting Brackets for Walls and Large Wooden Posts Deck Railing - 3.15inch

["【Important】Mount on the post or wall width 5.5*3.15inch, you should double-check your railing or post dimensions before ordering","This umbrella holder is heavy-duty alloy steel with professional anti-rust coating for ultimate outdoor durability and stability","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; the umbrella mount size is 5.5*3.15 inch"]