Eight heavy-duty metal ribs radiate from the powder-coated metal pole to support the 8.5-ft square canopy, creating stable shade for outdoor seating or dining areas. The 160 G polyester fabric canopy is wear-resistant and sun-proof to handle regular patio use. A built-in crank handle on the center pole lets you open and close the umbrella smoothly. The two-piece pole connects with a spring button for straightforward assembly, and an umbrella base is required and not included.