Park your patio umbrella exactly where you want it and roll it back into the shed when summer ends. This fillable umbrella base stand accepts water or sand through a generous injection hole for serious wind ballast: up to 54 lbs of sand or 36 lbs of water. Four casters (two lockable) move the base smoothly across pavers and lock it firmly in place once positioned. A tightening knob secures 1.25 in or 1.9 in pole diameters.