Dialed-in comfort starts with three-way adjustment: this aluminum alloy boat seat pedestal raises from 13.39 to 19.2 inches, rotates a full 360 degrees, and slides forward or backward for the ideal seating position and sightline. Heavy-duty thickened aluminum resists deformation and corrosion, standing up to spray and humid marine environments. A quick-turn knob locks both height and angle to eliminate wobble and keep you steady underway. Pre-drilled holes align with the deck for straightforward mounting, and the versatile base fits many boat seats on fishing boats, yachts, and canoes. Stainless steel mounting screws are required and not included.