Patio Umbrella Base - 55 lb. Steel 24 in. Round Umbrella Base
Amazon.com : ShengBang Patio Umbrella Holder Heavy-Duty Adjustable Metal Sun Umbrella Clamp Stand Umbrella Clamp Mount Bracket for Deck Railing,Outdoor Courtyard,Balcony,Boats(Fit Max OD 2 inch) (2) : Patio, Lawn & Garden
Freestanding Base for Sidepost & Offset Patio Umbrellas - FSB
Free Standing Umbrella Base on Pool and Spa Supply Store