Heavy Duty Concrete & Steel Patio Umbrella Base, 55 lbs Weight, Fits Up to 12 Ft Canopies, Stable Foundation with Tightening Knob for Backyard Shade & Outdoor Dining

55-lb concrete & steel construction provides unmatched stability against wind and uneven surfaces, ensuring secure umbrella placement in all weather conditions Universal fit accommodates patio umbrellas up to 12 ft in diameter with adjustable tightening knob for precise canopy alignment Black finish blends seamlessly with modern outdoor decor while resisting fading and corrosion for lasting aesthetic appeal Compact 19.7"x19.7" footprint optimizes space under tables while maintaining sufficient weight distribution for large canopies Durable material combination withstands UV exposure and moisture damage, maintaining structural integrity through seasons of use