Crafted from high-strength HDPE material, this umbrella base is waterproof, aging-resistant, and exceptionally durable. Its innovative design features four large refillable reservoirs, enhancing wind resistance and stability. With four plates, installation is a breeze—no tools required. The interlocking plates securely lock together without the need for metal pins, ensuring hassle-free setup. Ventilated holes at the bottom increase friction for greater stability, while grooved handles make it easy to move around. When not in use, the four plates can be stacked for space-saving storage. Compatible with most patio cantilever umbrellas with a pole diameter ≤ 2.5", this base is suitable for various residential and commercial uses, including patios, gardens, and coffee shops. For superior safety, the base sits over the cross bars. Note: Umbrella not included.