16 to 20 in Adjustable Height 1.77 Snap-Lock Power Post with Seat Mount - Swivl-Eze
16"-20" High, Clear Anodized. Adjustable Height Posts - Power Pedestals with Integral Seat Mounts. ABYC Rating: B - Not for speeds above 5 mph.
Used by Crestliner boats as original equipment. All posts include a larger locking clip with metal insert which allows the post to positively lock to bases for added security.