● Made of high-strength HDPE material waterproof aging-resistant durable enough● Designed with 4 large refillable reservoirs enhance wind resistance and stability● Designed with 4 plates easy installation no tools are required ● The interlocking plates do not require metal pins for locking● The bottom ventilated holes increase friction for greater stability● Comes with grooved handles on the bottom easy to move around● 4 plates can be stacked for space-saving storage when not in use● Suitable for most patio cantilever umbrellas the umbrella pole diameter ≤ 2.5"● Suitable for various residential and commercial uses: patio garden coffee shop etc● The base sits over the cross bars for superior safety● Note: The Umbrella is not Included