Four universal wheels built into the base let you roll your market umbrella across the patio instead of lifting it, and two wheel locks hold it in place once you position it. The HDPE shell can be filled with up to 100 lbs of water, 132 lbs of sand, or 176 lbs of mixed fill through a large side spout to stabilize your umbrella. A metal support tube with two adapters fits 1.4-in, 1.5-in, and 1.9-in umbrella poles for secure mounting. At 13.5 lbs empty, the base is easy to move for off-season storage.