EASY MOBILITY - A set of four wheels let you move this base across multiple surfaces while two wheel locks help keep your shading in placeSTURDY ANCHOR - A heavy weighted base keeps your umbrella firmly in place-resisting the wind while supporting your shade; weight with sand - 136.70lbs/ weight with water - 94.47lbsREFILLABLE RESERVOIR - Fill the hollow chamber with 120 pounds of sand or 38 liters of water, then use a pair of tightening knobs to secure your umbrellaUSE IT ANYWHERE - Perfect for any patio, deck, or outdoor seating area, the wheels roll freely across wood or concrete and lock in place for long days in the shadeFITS MARKET UMBRELLAS 6-12FT - A contemporary design blends with most outdoor decorations and fits most market umbrellas sized 6-12ft with poles sized 1.5-1.9inDIMENSIONSOverall Dimensions - 24"(L) x 24"(W) x 18.5"(H)Receiver Dimensions - 10.25"(H) x 2.5"(Dia)Base Plate Thickness - 3.5"(H)Weight (Empty) - 16.70 lbs.Weight (Filled w/Sand) - 136.70 lbs.Weight (Fille