Attwood 9 D-Shaped Boat Seat Pedestal Base This boat seat pedestal base is constructed from aluminum for durability in marine environments. A clear coat finish helps improve resistance to corrosion and scuffs. This socket base requires a 3 mounting hole diameter. Product Features Aluminum Construction Clear Coat Finish 9 D-Shape Use with 238 Series Posts California Residents WARNING Cancer and Reproductive Harm - P65Warnings.ca.gov Other Details Google Product Type Pedestal Product MPN 238322-1