Attwood accessories Swivl-Eze™ Lock'N-Pin™ 7" L x 7" W Stainless Steel Non-Threaded Square Base with Nylon Bushing & Steel Lip Tube for 3/4" D Post, Aftermarket (SP-67739) by Attwood®. Whether for seat replacement or installation, this sturdy and dependable seat mounting solution will make the process fast, easy and worry-free. Constructed from top-notch materials to withstand punishing marine conditions, it will provide proper and secure mounting of your boat seat, ensuring reliable function and long-lasting service.