Attwood Aluminum Square Boat Seat Pedestal BaseThis aluminum boat seat pedestal is constructed for longevity in marine environments. This square boat seat base requires a 3.5" diameter mounting hole and has a 7" x 7" footprint.Product Features: 7" x 7" Square Seat Mount; Centered Hole; Brushed aluminum finish for appealing look and corrosion resistance; 3.5" Diameter Mounting Hole; Six bolt or screw attachment;