Aquos New Adjustable Boat Seat Pedestal Smooth 360&deg; Rotation Gas Lift Swivel, Support 13"-18" Bass Fishing Boat,Aluminum,Wooden Boat,Fiberglass Hard Hull Boat,Boat Accessories Height Adjustable with a gas lift between 13" and 18". Gas lift swivel can be simply install on the board of plywood , aluminum, fiberglass hard hull boat. EDC-coated heavy gauge hardened steel for maximum strength and corrosion resistant for long-lasting performance in marine environments. Low profile design -suits most standard marine seats, Ideal for fishing, cruising and recreation vessels. swivels with gas lift runners for silent ,smooth 360' rotation Ergonomic positive-locking handles with stainless steel components