The 4 square plate construction provides a stable support for your offset patio umbrella stand. It is made of high density HDPE material, ensuring durability and protection against sun and water damage. Fill the plates with sand or water to enhance stability during windy conditions. These plates are suitable for 9 ft and 10 ft offset patio umbrellas. The 4 solid metal connecting hooks securely connect the plates together. The easy-to-fill spout allows for convenient filling, cleaning, and storage. Each plate has a portable handle for easy carrying. These plates firmly fix the cross bracket and umbrella pole, making them perfect for use in gardens, backyards, porches, poolside areas, patios, and even commercial settings.