Two fine screw knobs can adjust the tightness of the tube to firmly fix the fishing umbrella. Umbrella fixing bracket has two screw knobs, which can adjust the tightness to fit different sizes of umbrella handles and prevent the umbrella from falling. Suitable for umbrella handle diameter less than 29mm. There is a slot on the plate where the base can be easily mounted, and the screw knob on the side of the tube can help strengthen the seal between the base and the plate. Great accessory for fishing lovers, lightweight and portable, free your hands for better fishing. The umbrella holder can firmly fix the umbrella on the fishing box, protects you and your fishing tools from the sun or rain, even on hot summer days or rainy days. Specification: Material: Stainless Steel Color: Silver Umbrella Base Size (Length * Height): 70 50mm / 2.76 1.96in Mounting Plate Size (Length * Width): 70 60mm / 2.76 2.36 inches Suitable for: The diameter of the umbrella handle is about 29 mm Adjustable umbrella stand is made of stainless steel, sturdy, anti-deformation, rust-proof and durable, can be used for a long time even in bad weather. Two fine screw knobs can adjust the tightness of the tube to firmly fix the fishing umbrella. Suitable for balconies, gardens, parks, fishing, snack bars, shops, restaurants, etc. The umbrella stand support base can apply for fishing fort, fishing reservoir, rod fishing platform, fishing chair, fishing box, etc. Can be used under the scorching sun or against winds. Package List: 1 Adjustable Umbrella Stand 4 Screws