The Clamp-On Seat mount attaches on flat surfaces with 90-degree angles on both sides and fits most seat hole patterns. It is a black powder coated swivel with rubber coated mounting legs. This seat mount has a 360-degree swivel and easily adjusts from 7-1/2” to 18” (19cm - 45.7cm.) It is easy to remove and install which makes is great for use in duck hunting boats and fishing boats.