Springfield Marine knows that comfort is important in marine seating. Whether behind the wheel for long passages in rough water; dropping a line in a quiet creek; or anywhere in between, Springfield Marine offers a wide range of configurations and options. Features High-Strength Aluminum To Withstand All Conditions Below The Deck Mount Requires A 3-1 by 2 in. Hole In Deck Built to provide secure, hassle-free boat seat mounting Will help bring your seat to its tip-top functionality Designed to help you get the job done quickly and easily Sturdy construction built to handle harsh marine conditions Specifications Size: 9 in. Material: Aluminium