About This Product This freestanding umbrella base helps you create a shady, outdoor oasis on your porch or patio. The smooth, unadorned base showcases a textured, petal-like motif for some contemporary flair to your favorite outdoor market umbrella (not included). An adjustable tightening knob provides the ability for most umbrella sizes to stand on their own. This piece is crafted from plastic with a weather-resistant matte black finish, so it's sure to stand up to strong UV rays and the occasional rainstorm rolling through. Plus, it's easy to fill up with sand or water to make sure it stays in place. Features Maximum weight: 45 lbs when filled with water or 71 lbs when filled with sand. The weight can be filled with either water or sand for stability and support. This umbrella base is resistant to harsh UV, fade, stain, and rust. Note: Water and sand are not included with the base. Hand-turn knob to fix the umbrella: The round base design of this product is big enough to hold the umbrella, and features one hand-turn tightening knob for securing an umbrella to the base. One hole inside and one knob outside could fix your umbrella tight. Plastic inserts on the top of steel pipe fit for 1.5" to 1.9" diameter umbrella poles. Rustproof and anti-corrosion material: Made of durable HPDE plastic material, all-weather resistant, steel pipe and would not be corroded easily. Its unique interchangeable sizing inserts and adjustable tightening knob provides support to most umbrella. This stylish accessory is sure to please. Water-filled umbrella base: One switch beside the center part is used to fill water or sand. It could make this base more sturdy and increase weight support capacity. Ideal for commercial and residential Use. Perfect for garden, backyard, porch, poolside, patio, or commercial use. Heavy-duty HDPE plastic for lasting quality, stability, and durability. Umbrella length capacity: 9 to 11 feet