Wise Seats Adjustable Seat Pedestal Mount 12-18 8WP21-18S This Wise Adjustable Seat Pedestal can adjust from 12 to 18 in height. Features a thick walled, 2-78 polished aluminum post for maximum durability and longevity. Includes seat spider mount with adjustment knob and locking paddle handle. The standard 5-14 hole pattern fits virtually all marine seat brands. Adjusts from 12 to 18 2-78 Polished anodized aluminum post 9 Diameter base with recessed mounting holes 360 Degree rotation with locki