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