1. Two setting buttons: The umbrella can be fixed to the base with two manual squeeze buttons. There is a hole and a button on the outside to adjust the umbrella firmly. Do not fill with water at 32°F or below to prevent burns and cracks 2. Water or sand filling: The base can be weighed with sand or water, up to 50 pounds, and can be easily transported when drained. Note: Water and sand are not included. Recommendation: Use the base with a patio table 3. Material: Strong and durable HDPE plastic, all windproof, made of steel pipe, not easy to corrode, and can be used for a long time. With good sturdiness, your pole will not swing easily 5. Easy to assemble: The base is available in a variety of umbrella sizes. Adding plastic to the steel pipe φ1.5' (38mm) -φ1.9' (48mm) is an ideal choice for umbrella poles. You just need to put the umbrella pole on the base and squeeze the button Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.