Giving you an outstanding economical performance in a pedestal post, Lock&';N-Pin is designed by experiences and actual boaters who you use them regularly. The patented system leads the industry in safety, and prevents unintentional detachment for seat mounts, posts and bases, leaving you safely seated, and not nose down in your windshield or on your boat floor. Which I think we can ALL say is a safe way to go. Brushed Aluminum Post Fixed 13" Height 1.5" Diameter Non threaded Steel Pin Exceeds ABYC Standard H31.6.1 Gives you outstanding economical performance Design is proven by decades of experience Patented Lock&'; N-Pin system leads the industry in safety Lock&'; N-Pin prevents unintentional detachment for seat mounts, posts and bases