Need a sturdy base for your patio umbrella that you can actually move around? This Yaheetech base is your answer. It's a heavy-duty cube with 4 wheels and 2 locking casters, so you can roll your set-up wherever you want, then lock it in place. The 37L capacity tank can be filled with water (for about 82 lbs of weight), sand (for about 132 lbs), or a mix. When filled, it provides plenty of weight to keep even a large umbrella from tipping over in the wind. It fits standard umbrella poles from 1.5\ to 1.9\ in diameter, secured by two thumb screws. The black finish and smooth, rounded corners make it safe and stylish for any deck, poolside, or garden. When empty, it's only about 12 lbs, so it's easy to store or transport. A super practical upgrade for your outdoor space.