Attwood Lock’N-Pin 3/4 in. Pin Posts feature a design that has been proven through decades of experience. The patented Lock’N-Pin system leads the industry in safety by preventing the unintentional detachment of seat mounts, posts and bases. Lock’N-Pin products exceed ABYC Standard H31.6.1. Height: 11 in. Dia: 1.5 in. Brushed Aluminum finish. Non-threaded.