This Is Our 17.5'' Round Diameter Umbrella Base, Which Is Ideal For Holding Your Umbrella Securely And Evenly In Place. It Is Really A Practical Addition To Your Backyard Or Your Patio Area. Includes A Coupler To Allow It To Fit 38mm To 48mm (By Adjusting The Adapter) In Diameter Umbrella Poles.Includes A Hand-Turn Knob For Securing Umbrella To The Base.FeatureHolding your umbrella securely and evenly in placeBeautiful decorative pattern and bronze finishSteel upright and Cast stone constructionStrong and sturdy,for long life-timeSimple assembly requiredSpecificationMaterial:Steel upright and resin baseOverall size:17.5''x17.5'' x13(LxWxH)Steel upright Size:diameter 57mm & 10''hightWeight:30lbsPackage Size:23''x20''x5'' (LxWxH)1x17.5'' Square Umbrella Base