Package Includes: you will get 4 pieces of pool umbrella stabilizer sleeve, enough to meet your use needs, you can use them anywhere you need, such as on your deck, you can also send them to your friends. Suitable Size: the pool umbrella adapter has an inside diameter of 4 cm/ 1.57 inches and a height of 3.5 cm/ 1.38 inches, suitable for mounting the 1 3/4 inch umbrella insert on your pool deck; The dimensions listed reflect the diameter of the umbrella pole, not the hole in the pool deck, please note that they do not fit on patio tables. Practical Features: the umbrella pole stabilizer can effectively stabilize your swimming pool umbrella from wobbling or tilting; You can install it easily, which will save your time and effort. Long Lasting and Corrosion Resistant: the umbrella sleeve adapter for pool is made of quality plastic material, UV resistant and corrosion resistant; It can withstand the wind and sun, will not break or deform easily, you can use it for years. Multi Scene Utilization: the umbrella stand adapter is simple in appearance and understated in color, it blends in well with the surroundings, you can use it for swimming pool umbrellas, outdoor sunshades and beach umbrellas.