Fill the base with water or sand, weighing it down with up to 50 pounds, or leave it empty for a lightweight stand that's easily portable.Built to last for years to come, this birdhouse is made of durable plastic for realistic appeal. It includes a solid plastic pole tube for placing your umbrella inside, ensuring stability and longevity.With a versatile base accommodating most market umbrellas, this base stand is suitable for parasol poles between 30 to 38 mm thick.Ensure optimal strength and stability for your umbrella with the adjustable knob in the plastic pipe of this base stand, accommodating various umbrella pole sizes.For easy storage, simply detach the plastic tube to achieve a slender design, enabling you to store the base in a compact space during periods of non-use, such as winter.