Garelick/Eez-In 99023:01 Standard Series Swivel Seat Mount Top 4 Prong Spider Swivels 360 Degree And Locks Positively Fits All Garelick 2 7/8" (7Cm) Diameter Stanchion Pedestal Seat Bases High Tensile Aluminum And All Stainless Hardware Anodized Aluminum Finish 4 prong spider swivels 360 and locks positively Fits all Garelick 2 7/8" (7cm) diameter stanchion pedestal seat bases High tensile aluminum and all stainless hardware Anodized aluminum finish