Fixed Height Locking Pedestal - 15" in height, fore & aft slide mount allows for 5" of seat travel Thick walled, 2 7/8" polished anodized aluminum post, 9" diameter base with recessed mounting holes Seat spider mount with adjustment knob and locking paddle handle, 360° rotation with locking knob, seat slide mount allows for 5" fore and aft travel Standard 5 1/4" hole pattern fits virtually all marine seat brands Class AD certified per ABYC standards