This 83-pound patio umbrella base features a sleek and classic black design, adding a touch of stability to your outdoor space. The unique dual-adjustment knob design allows you to easily adapt to different sizes of umbrella poles, ensuring that the umbrella base matches the pole perfectly. The water or sand filling design increases the stability of the umbrella base, giving you peace of mind when using it outdoors. Lightweight and easy to move while providing enough support, it is ideal for your outdoor recreation. Features: Filled with Water/Sand: This round umbrella base can be weighed with 83 lbs. of sand or 19 liters of water. You can also mix some water and sand to increase weight. High quality material: made of sturdy and durable high-density polyethylene plastic, it is durable in all weather, can be used for several years, including a galvanized steel pipe, not easy to corrode, has good firmness. Fit for various umbrellas: the multifunctional patio umbrella base can accommodate all patio umbrella and market umbrella, with 2-adjustable knobs, used to secure the umbrella to the base, very suitable for market umbrella with a pole (diameter of 1.5 in.-1.89 in. ). Easy to install and store: just follow the instruction to install all the components together, when not in use, it's advised to disassemble the steel tube for a compact space. Widely use: outdoor umbrella base can be used on various occasions, both home and commercial, perfect for lawn, beach, garden, balcony, deck, pool, barbecue bar and so on.