• Premium HDPE material is non-fading, long-lasting and sun-proof • Equipped with a built-in stabilizer and adjustable knob for secure fit • Suitable for 1.5-1.9" umbrella pole with 2 adapters • Suitable for 8-9 ft patio umbrella • Heavy-duty concrete filling ensures a total weight of 21 lbs to enhance the stability • Simple installation requires no extra tools • Faux rattan texture adds visual interest