1. Sturdy 4Panel Design: This detachable fourpanel square umbrella base, interlocked with four metal fittings, ensures heightened flexibility to meet diverse needs. Good for cantilever and offset umbrellas. Our umbrella stand outdoor base provides stable support. 2. Materials: Made from HDPE material, the fillable patio umbrella base resists oxidation, corrosion, and cracking, maintaining its strength and color even under prolonged outdoor exposure to UV rays, rain, and moisture. 3. High Weight Capacity: The outdoor umbrella base can be filled with 132 pounds water or 176 pounds sand, providing ample weight to keep your umbrella upright even during strong winds. It features fill ports and twist caps on each panel for easy filling and draining. 4. Convenient Design: Embedded handles on the backside facilitate easy transportation, making the patio umbrella stands bases easy to carry. When not in use, this umbrella base stand can be disassembled, with the four panels stackable for spacesaving storage. Dimensions per panel: 19.7'L 19.7'W 2.8'H.