Attwood Aluminum Square Boat Seat Pedestal Base This 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 Diameter Mounting Hole Six bolt or screw attachment California Residents WARNING Cancer and Reproductive Harm - P65Warnings.ca.gov Other Details Goog