djust up and down. front and back. Swivel 360֯,adjustmet from 15 - 19 inches,SLIDER ADJUSTMENT to move seat front and back. Swivel action for 360 DEGREE SEAT ROTATION, access to different boat areas from your place. 
This adjustable boat seat pedestal is also called as boat pedestal base, marine pedestal base, adjustable marine seat post, plug in boat seat pedestal swivel, captain boat seat post, marine pedestal seat, boat seat slide mount, captain seats for boats, 
Aluminum boat seats with swivel, boat pedestal seats for boats, boat chair mount, fishing seat pedestal base, pedestal seat kit. 
The pedestal comes with spring loaded locking lever. 
High strength and corrosion resistance.