Taper-Lock(TM) 9" Diameter Satin BaseFeatures: High-strength aluminum to withstand all conditions Below the deck mount requires a 3-1/2" hole in the deck 8" mounting hole pattern Flat side bases for limited space applications Use with any Taper-Lock(TM) post (sold separately) Warranty: 5 Years WARNING: This product can expose you to chemicals which are known to the State of California to cause cancer, birth defects or other reproductive harm. For more information go to P65Warnings.ca.gov.