Our boat seats are suitable for a wide range of hulls. It can be used in two ways. The bottom expansion rod and 360 turntable can be removed and used separately. At the same time, if your boat is equipped with a slide rail, it can be installed without damage. The adjustable size of the bottom expansion rod is 20.5-27.5inch/52-70cm. Our boat seats can be used with our rail mount fishing rod holder to free your hands while fishing! And the high quality rigid seat frame can withstand the harsh marine environment.