● Constructed of powder-coated steel weather-resistant anti-fade rustproof durable● 2 sizes of adapters suitable for patio umbrella poles of 1.6"/ 1.9" diameter● The adjustable tightening knob helps secure the umbrella pole● The bottom anti-slip footpads help keep stable on uneven ground● The simple all-black appearance can perfectly blend into your outdoor decor● Easy and quick to set up just rotate the pole and install 4 footpads● Widely used in the patio poolside backyard balcony commercial place and so on● The flat umbrella base can be placed under the patio table