All Taper-Lock™ Series feature a taper that allows pedestal to fit snugly and disengage as needed. Additionally, the locking "tab" feature prevents the pedestal from turning. Post end has Delrin bushing and each is slightly tapered. The taper matches to a taper in the socket of the pedestal base. Seat mount is die-cast aluminum with black E-coat finish. Swivels 360°.