Four 360° swivel universal wheels and two retractable side handles let you roll this 51-lb umbrella base across patios, gardens, or other hard surfaces without heavy lifting. Once positioned, the wheel locks help keep the 20.5 x 16.5 in base steady while the umbrella is open. A high-strength resin body and powder-coated metal supporting pole are built for outdoor moisture and aging resistance. Two included adapters fit 1.5-in and 1.9-in umbrella poles, and a hand-turn handle tightens the pole to help it stay upright.