This Attwood Wedge™ 2 3/8-Inch Extension Post provides a sturdy, dependable, and height-adjustable mounting point for a boat seat. This 2 3/8-inch-diameter Extension Post features satin anodized aluminum construction, and its height is adjustable and comes in 13 to 19 Inches and 24 to 30 Inches (each length sold separately). A locking tab reliably locks the post to the base (sold separately), and the Wedge™ bushing locks the post in with a tight, solid fit. The bushing is securely mounted to the post with 2-point stainless steel riveting. This post has an integral seat mount, and it 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.