Taper-Lock 9" - Flat Side BaseFeatures: 9" Flat Side Base With 8" Hole Pattern High-Strength Aluminum To Withstand All Conditions Below The Deck Mount Requires A 3-1/2" Hole In Deck Use With Any Taper-Lock(TM) Post (sold separately) 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.