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 (Filled w/Water) - 94.47 lbs.SPECIFICATIONS - Material - HDPE Plastic, SteelFill Capacity (Sand) - 120 lbs.Fill Capacity (Water) - 38 LSuitable For Poles - 1.5"-1.9"Includes - Umbrella Base, (2) Rolling Casters, (2) Locking CastersAssembly required (with instructions)For Residential Use Only