Swivl-Eze Lock'N-Pin Boat Seat Mount with Spring - 2-3/4in Pin The 3/4in system gives you outstanding economical performance; The design for the Swivl-Eze Lock'N-Pin Boat Seat Mount with Spring is proven by decades of experience.; The patented Lock' N-Pin system leads the industry in safety; Lock' N-Pin prevents unintentional detachment for seat mounts, posts and bases; Lock' N-Pin products exceed ABYC Standard H31.6.1; Istalled Height: 2in; 3Adeg Tilt;