Four interconnected sections create a square cantilever umbrella base that you can fill with a water and sand mixture to add 285 to 375 lbs of stabilizing weight for your umbrella. The integrated cross-base helps limit unwanted movement while supporting 8-10 ft or 8-12 ft cantilever umbrellas with 360° rotation. Four rolling wheels and grooved handles let you reposition the base more easily when empty. Two inlets and two outlets simplify mess-free filling and draining between seasons.