This Swivl-Eze 238 Series Extension Post is a sturdy, reliable post that provides additional height for a boat seat. This fixed-height Extension Post measures 30 inches tall (measured from the deck to the top of the seat mount). This post is part of the Swivl-Eze 238 Series of seating-related products, and it has a 2 3/8-inch diameter. This Extension Post meets ABYC Code B standards. Attwood Corporation has been an award-winning leader in engineering, testing, and manufacturing of the highest quality marine products for over 100 years. We deliver safe and reliable lighting, fuel systems, water systems, seating & pedestals, swim ladders, custom upholstery, and general marine accessories that are easy to install and meet regulatory compliance.