Garelick/Eez-In 75083 Provides Smooth Fore And Aft Travel And 360 Degree Seat Rotation Adds Comfort And Stability For Any Swivel Boat Seat Mounts Underneath Seat And On Top Of Pedestal Stanchion Compatible With Any 2 7/8"(7Cm) Diameter Tube Convenient handles provide solid locking at any position Provides smooth fore and aft travel and 360 seat rotation Adds comfort and stability for any swivel boat seat Mounts underneath seat and on top of pedestal stanchion Compatible with any 2 7/8"(7cm) diameter tube Convenient handles provide solid locking at any position