Thanks to the Clamp On Boat Seat Swivel, you can enjoy the flexibility and convenience of full 360-degree movement onboard your boat. The boat seat swivel is easily mounted, and attaches on any flat surface. This boat seat swivel mount is designed to fit most seat-bolt patterns and it can be adjusted from 7.5" to 18" for more compatibility, which gives you even more freedom when installing. The Clamp on Boat Seat Swivel features an aluminum construction that is resistant to corrosion, making it ideal for usage on the water. It is black powder-coated for added durability.