-Sturdy 4 square plate construction supports your offset patio umbrella stand stably-Made of high density HDPE material sun-proof waterproof and durable-Filled with sand or water to add additional weight to improve stability in windy conditions-Applicable to 9 ft and 10 ft offset patio umbrella-4 solid metal connecting hooks can firmly connect the board into a whole-Easy-to-fill spout makes for convenient filling cleaning and storage-Portable handle of each plate for convenient carrying-Firmly fix the cross bracket and umbrella pole-Perfect for garden backyard porch poolside patio or commercial useâ- Detachable 4 Plates - The umbrella weight is compatible with offset umbrellas equipped with a cross base. 4 detachable plates can be stacked together for storage with less space taken.â- Study Construction - The offset umbrella base is made of heavy-duty HDPE plastic which is rugged and weather-resistant sun-protection that prevents cracking and is easy to maintain.â- Fill Water or Sand