Designed for half patio umbrellas mounted against walls or balcony railings, this 17.5 x 16 x 11 in Hdpe base accepts up to 29 lbs water, 40 lbs sand, or 49 lbs mixed fill. Two interchangeable adapters fit 1.5 in and 1.9 in pole diameters, and a metal tube reinforces the Hdpe shell against cracking. The 4.5 lb empty weight with a cut-out handle makes the base easy to reposition.