The Clamp-On Boat Seat Swivel helps to ensure your sitting in the right position every time you head out. This durable seat swivel has a black powder coating and fits most seat hole patterns. The Attwood® Clamp-On Boat Seat Swivel adjusts from 7 1/2” to 18”. FEATURES: Black powder coated Fits most seat hole patterns Adjusts from 7 1/2” to 18”