Package Includes: You will receive 4 pool umbrella stabilizer sleeves, sufficient for your needs. These can be used on your deck or other suitable locations. 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), designed to fit 1 3/4 inch umbrella poles commonly used on pool decks. Note that these dimensions refer to the umbrella pole diameter, not the hole in the deck, and they are not intended for use with patio tables. Practical Features: The umbrella pole stabilizer helps prevent wobbling or tilting of your pool umbrella. Easy to install, saving time and effort. Long Lasting and Corrosion Resistant: Made from quality plastic material, this adapter is UV and corrosion resistant, durable enough to withstand outdoor conditions, including sun and wind, without cracking or deforming. Multi Scene Utilization: Featuring a simple design and neutral color, this adapter blends well with outdoor environments. Suitable for use with pool umbrellas, outdoor sunshades, and beach umbrellas.