Get your ship in working order with these Boat Seat Pedestals from Wise,A(R) all featuring polished anodized aluminum construction, 9" diameter base, 2 7/8" diameter pipe and locking 2 7/8" seat mount with 360Adeg swivel. 8WP21-18S Polished anodized aluminum post 12-18" adjustable height 27/8" seat post Seat spider mount with adjustment knob and locking paddle handle 9" diameter base with recessed mounting holes 360Adeg rotation with locking knob Standard 5 1/4" hole pattern fits virtually all marine seat brands Class AD certified per ABYC standards Order today!