Invincible Marine Heavy-Duty Seat Mount Made using the highest quality components Performance and quality tested The most trusted name in marine accessories and equipment Attaches to the bottom of your boat seat and features heavy-duty, plated steel construction for extra corrosion protection Pin-type seat mount is welded with reinforcing washers at all points of stress for maximum durability The seat mount assembly comes with a spring for added comfort Fits most 3/4-inch pin type extensions Comes with a 1-year warranty