Springfield Marine Taper Lock Deck Base 9" Surface-Mount. It is constructed of high-strength aluminum to withstand all conditions. Use with any Taper-Lock Post (sold separately). Does not require a hole in the deck for installation. Features of Springfield Marine 1600010 Taper Lock Deck Base 9" Surface-Mount Satin finish High-strength aluminum construction Surface mount does not require a hole in deck Use with any Taper-Lock Post (sold separately) 9" surface mount base with an 8" hole pattern Package Contents: Springfield Marine 1600010 Taper Lock Deck Base 9" Surface-Mount Springfield Marine 1600010: Taper Lock Deck Base 9" Surface-Mount