Features Adjustable knobs for universal sizing: Tighten the hand-turned knob in the steel tube to secure the umbrella to the base for optimum strength and stability. Double lock design, one hole inside and one knob outside, can fix the umbrella firmly Water or sand filling: The base can be filled with water or sand, has a maximum weight of 50 pounds, and can be easily transported when emptied. Base does not include water and sand. Do not fill with water at or below 32°F to prevent freezing and cracking Holds various umbrella sizes: The versatile base is designed with steel tubing for a wide range of applications and is ideal for holding most 6-10ft umbrellas. Plastic insert on top of steel tube is suitable for Î1.5"(38mm)-Î1.9"(48mm) umbrella pole Applicable scene: This umbrella bottom is designed with line style, elegant and classic, suitable for families, villas, terraces, resorts, water parks, barbecue bars, outdoor leisure areas, company rest areas, etc. The best choice for your leisure Product DescriptionSimple Deluxe 24.2 lbs 17.72" Market Umbrella Base Heavy Duty Round Stand for Patio Outdoor, Deck, Bronze