Wise 8WP144 Standard Mainstay Seat Pedestal This Wise Standard Mainstay Seat Pedestal is great for freshwater helm seat applications. This seat features air-powered height adjustment from 14 to 20. The included fore and aft slide mount allows for 5 of seat travel. Features Air-powered adjustable from 14 to 20 in height Fore aft slide mount 2-38 Diameter post 9 Diameter anodized base w recessed knurled mounting holes 360 Degree rotation with locking feature Class AD certified per ABYC standards