BuyGoe 2 PCS Heavy-Duty Patio Umbrella Holder, Fits Umbrellas up to 2", Adjustable Deck Umbrella Mount Outdoor Post Mounting Brackets for Deck Railing - Small Size 5.9 inch

["【Important】Mount on the post width 3\" to 4.8inch and depth not more than 2.8\", 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","Upgrade#3 - Added rubber pad to each clamp, which will prevent slipping and protect your railings from scratches","Fit pole diameter 1\"-1.7\", by removing the long card inside, it fits max 2 inch; the umbrella mount total 5.9 inch long"]