1. Stable and The 2 part pool umbrella stabilizer adapter was developed to provide stability and prevent wobbling or tipping of your pool umbrella. Made of plastic, it is built to hold and withstand outdoor elements. 2. The pole stabilizer sleeves are trouble to install and save you valuable time and effort. Insert them into the ground and place your umbrella in the adapter. You don't have to worry about complex assembly or complicated instructions. 3. Compatibility With an inner diameter of 4 cm (57 inches), these umbrella adapters are specially designed for 1 3/4 inch umbrella inserts. They are suitable for various environments such as gardens, outdoor sun umbrellas, and beach umbrellas. 4. Made of durable plastic material, these umbrella stabilizer sleeves are built to withstand the elements and ensure a long lifespan. You don't have to worry about rust or deterioration, providing you with a reliable solution.