The Lock 'N Pin 3/4" Pedestal System gives you outstanding economical performance. Designed to prevent unintentional detachment of seat mounts, posts, and bases, Lock 'N Pin components exceed ABYC standards. 1-1/2" dia. posts are made of brushed aluminum. Posts have non-threaded steel pins. Meets ABYC standards. Adjusts from 25" - 31"H. 1-1/2" diameter.