Seat Mount Features heavy duty, zinc plated constructions for extra corrosion protection. Pin-type seat mount is welded with reinforcing washers at all the points of stress. Rotates a full 360 degrees. Seat Posrt Posts fit all 3/4" pin-type bases. Sturdy, satin finish aluminum Stainless steel base plate is welded with reinforcing washers for strength and durability. Comes standard with six countersunk mounting holes.