Package includes: 4 gray pool umbrella stabilizer sleeves, enough to meet your needs. You can use them wherever you want, such as on your patio, or give them to your friends as gifts. Suitable size: The pool umbrella adapter has an inner diameter of 3.8 cm and a height of 3.5 cm, which can fix a 4.4 cm umbrella on your pool deck. The dimensions shown are the pole diameter, not the deck hole diameter. Please note that they are not suitable for patio tables. Practical features: The pole stabilizer effectively stabilizes your pool umbrella and prevents it from wobbling or tipping over. Installation is simple, saving you time and energy. Durable and corrosion-resistant: The pool umbrella adapter is made of quality plastic, which is UV-resistant and corrosion-resistant. Resistant to wind and sun, it will not break or deform easily, you can use it for several years. Versatile use: This umbrella stand adapter is simple in appearance and sober in color. It blends perfectly with your surroundings. It can be used for pool umbrellas, outdoor umbrellas, and beach umbrellas.