PATENTED DESIGN - This unique and original design was created by our in-house product developers and is exclusive to Best Choice ProductsEASY MOBILITY - A set of four wheels allow you to effortlessly move this base back and forth while two locks keep your shading in placeREFILLABLE RESERVOIR & TIGHTENING KNOBS - 2-fold stability system uses a pair of tightening knobs to ensure a secure fit while the fillable base holds up to 123.2 pounds of sand or 37 liters of waterUSE IT ANYWHERE - Perfect for any patio, deck or outdoor seating area, with a set of two wheel locks for extra securityFITS MARKET UMBRELLAS 6-12FT - A contemporary design blends with most outdoor decorations and fits most market umbrellas sized 6-12ft with poles sized 1.5-1.9in.DIMENSIONSOverall Dimensions - 22"(L) x 22"(W) x 7"(H)Receiver - 10.5"(H) x 2"(Dia)Weight (Empty) - 14.3 lbs.Weight (Filled w/ Sand) - 137.5 lbs.Weight (Filled w/ Water) - 95.7lbs.SPECIFICATIONS - Material - HDPE PlasticFilling Capacity (Sand) - 123.2 lbs.Filling Capacity (Water) - 37 LMinimal Assembly required (with instructions)For Residential Use Only