The Lock 'N Pin 3/4" System gives you outstanding economical performance. Designed to prevent unintentional detachment of seat mounts, posts, and bases, Lock 'N Pin components exceed ABYC standards. 1.5" dia. post is made of brushed aluminum and features a non-threaded steel pins. The complete Lock 'N Pin Kit includes a 13" fixed height post, seat mount, and base plate.