Attwood Seat Swivel - For maximum durability use this zinc-coated seat swivel that is corrosion resistant. With a 360 degree ball-bearing seat swivel allows for complete access to the boat right from the seat attached to this swivel. Adapters to change a post installation or swivel location360 degree ball-bearing seat swivel5 1/4in universal mounting hole patternZinc coatedCorrosion resistantBlack powder coated0 degree tilt