Seat Mount attaches to the bottom of your boat seat and features heavy-duty stainless steel construction for extra corrosion protection. This pin-type seat mount is welded with reinforcing washers at all points of stress for maximum durability. Mount rotates a full 360 degrees Unintentional detachment to comply with ABYC. E-coat rust resistant finish. Fits bolt pattern 4.5″ to 5.5″ square.