Sturdy Structure: Patio umbrella base has built in cross to ensure that the base of this umbrella is stable in strong winds and other bad weatherFeatures: Parasol base stand has 2 large filling ports, which can be easily filled with sand or water by simply unscrewing the top cover. In addition, the side drain port allows for easy emptyingEasy to Use: Fillable umbrella base comes with 4 built in wheels and a groove handle, so it can be easily moved to anywhere you wantWide Application: Filled umbrella weighted base is suitable for patios, poolsides, beaches, terraces, decks, lawns, gardens and other scenes as well as various commercial usesProduct Size: Outdoor umbrella base stand 33cmx33cmx19cm/12.99inchx12.99inchx7.48inch Specification: Material: PlasticProduct Size: 33cmx33cmx19cm/12.99inchx12.99inchx7.48inch Package Includes: 1 Patio Umbrella Base Note: Please allow slightly errors 1-2cm/0.39-0.79inch differences due to manual measurement.