【Durable Material】Umbrella base is made of durable HDPE material, all-weather resistant. Includes a solid steel pole, the steel pipe is galvanized and would not corrode easily. The tube to place your umbrella inside, it has good solidity and would not let the umbrella tile easily which makes this item more durable and reliable. 【Hand-turn Knob to Fix the Umbrella】The round base design of this product is big enough to hold various umbrella sizes, and features two hand-turn tightening knobs for securing the umbrella to the base. Double lock design, one hole inside and one knob outside which could fix your umbrella tight. Ideal for holding most 6-10ft umbrellas, plastic inserts on top of steel pipe fit for 1.5"(38mm)-1.9"(50mm) umbrella poles. 【Water or Sand Filling】One switch beside the center part which is used to fill water or sand, could make this patio umbrella stand more sturdy and increase the weight support capacity, it can be weighed down with up to 55 pounds of sand or 19 liters of water, or empty it out for a lightweight stand that can be taken anywhere. The base does not include water and sand. Do not fill with water at or below 32°F to prevent freezing and cracking. 【Wide Application】This umbrella base is line style design, black color, elegant and classic. It could be suitable for different decor designs, you could put it on courtyards, gardens, terraces, swimming pools, restaurants and other scenarios as well as a variety of residential and commercial uses. It could be a good partner to your umbrella. 【Customer Care】Every umbrella base has gone through rigorous testing by our company to ensure its durability. Product quality and customer satisfaction are our top priorities. If you have any problems in the use process, please do not hesitate to contact us via Amazon email. You can get 24-hour customer service help and a satisfactory solution.