"Adjustable Height Boat Seat Base - FixedEvery boat needs a great comfortable seat and every seat needs a fantastic base. Whether it's to provide a great view whilst sailing or to provide you comfort whilst fishing then our fantastic Pedestal Bases would be the perfect option.Our Pedestals are height adjustable from 13"" (330MM) up to 18"" (457MM) allowing you to find the optimum height for your comfort, when you have found your desired height it can then be locked into position. These are very easy to fit and the wide 165MM bases have multiple holes for mounting the item to your boat, the wide base also helps to provide stability and strength to these pedestals.Our fixed top pedestal can be fitted with a swivel to allow you to rotate your seat when needed. The ability to adjust the top would be ideal if multiple people sailed your boat, each person can set the seat to the optimum position for their maximum comfort.Made from strong, yet lightweight aluminium our pedestal's have been built to last. They are durable, hard wearing and extremely strong.SpecificationsTop Tube Diameter: 55MMBottom Tube Diameter: 80MMBase Diameter: 165MMMinimum Height: 330MMMaximum Height: 457MM."