Anchor any of our patio umbrellas with an exclusive base that allows umbrellas to stand without additional support. This impact-resistant black base fills with water to weigh almost 50 lbs, securing patio umbrellas against light winds, even without using a table. Wide bottom and hollow design make for easy shipping and greater stability. Accommodates umbrellas with central poles from 1″ to 2″ diameter. *****Base must be filled with water*******