Attwood Lock'N-Pin 3/4" 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: 13". Diameter: 1.5". Polished stainless steel finish. Threaded.