Durable Material: Made of high-quality stainless steel, sturdy, anti-deformation, rust-proof, and durable. Universal Adjustable: The fine screw knobs can adjust the tightness of the tube to firmly fix the umbrella. The umbrella handle diameter is 22-27 mm. Installation Tips: There is a slot on the plate that makes it easy to mount the base. The screw knob on the side of the tube can increase the tightness between the base and the plate. Stainless Steel Umbrella Holder: The umbrella holder allows you to easily attach sun protection so that you have a shady spot on your balcony even in hot weather. Suitable Occasion: Ideal accessory for fishing enthusiasts, simply connect umbrellas/parasols to balconies, terraces, pool decks, stands, benches, backsplashes, boats, fishing chairs, fences, etc.