Description: Premium Material: The pool umbrella stabilizer adapter is made of high quality materials, which is not easy to deform and can be used for a long time. Suitable Size: The pool umbrella stabilizer sleeve has an inner diameter of 4cm/1.57inch and a height of 3.5cm/1.38inch, suitable for installing 1 3/4inch umbrella inserts on the pool deck. Not suitable for patio tables. Features: The pool umbrella adapter can be easily installed, saving your time and energy. Function: The umbrella pole stabilizer can effectively stabilize your pool umbrella from shaking or tilting. Wide Application: The umbrella sleeve adapter can be used for swimming pool umbrellas, outdoor umbrellas and beach umbrellas. Size Chart: Inner Diameter: 4cm/1.57inch Height: 3.5cm/1.38inch Upper Outer Diameter:5.4cm/2.13inch Lower Outer Diameter:4.5cm/1.77inch Package Includes: 1 Pool Umbrella Stabilizer Adapter Note: Please allow slightly errors due to manual measurement and different monitors.