SAFEBOAT SWIVEL BASE MOUNT OPTION- SEVERE DUTY VERSIONNOTE- THIS IS ONLY THE SWIVEL BASE- NOT THE SEAT BASEYOU MAY STILL NEED THE SEAT BASE IF REPLACEING AN IN-DUTY SEATIMAGE SHOWN IS THE SEAT THAT IT WILL MOUNT UNDER.CUSTOM DRILLING AVAILABLE TO MATCH YOUR SEATS AT ADDITIOANL COSTThis optional mount kit will allow full rotation with stops at all 90 degree marksWhen installed- will add 4 inch height to overall seat so plan accordingly13x13x3Weight - 36#