Our patio umbrella base is made of heavy-duty HDPE plastic with a weather-resistant coating, durable and waterproof, suitable for cantilever offset umbrella with crossbars, ideal for commercial and residential use, such as garden, backyard, balcony, hotel, etc.
- Material:The surface of this round umbrella base is made of HDPE material;which has good wear resistance; electrical insulation;corrosion resistance;toughness and cold resistance;and can be used in various daily environments. 
- 4-Piece Weight Plates: 4 triangular black weight plates designed to fit in cantilever umbrella cross bases;square base when placed in each slot;cross base not included;only 4 refillable weight plates included. 
- Water or sand filling: weighs up to 180 lbs, when empty; this base weighs only 15 lbs; making it light and easy to carry; up to 100 lbs when filled with water; and 160 lbs when filled with sand;up to 180 pounds when filled with wet sand!One of the features of our umbrella base is that it is not easy to leak after water is filled. 
- The Waterproof Design Of The Knob: The knob of the irrigation part of the umbrella base adopts a threaded design, which can effectively prevent water leakage and is easy to fill 
- Convenient To Use And Storage: By filling these weight plates and fixing them on the cross base, you can place it wherever you want; When you are not using it, you can stack it up to save space 
- Easy to install: can be assembled by one person without any tools