This air-powered, heavy-duty helm pedestal is top-of-the-line for durability and strength. Easy-to-access lever lets you adjust the height from 14" to 20". Fore and aft seat slide provides 7" of travel. Dual locking system generates unsurpassed comfort and stability. 2-7/8" diameter post is ideal for saltwater, helm seat applications. 9" anodized base with recessed mounting holes. ABYC Class AD Driver rated. 3-year warranty. Locking seat mount with fore & aft slide Adjusts from 14"" to 20"" high ABYC Class AD Driver rated | Wise Heavy-Duty Mainstay Power Pedestal with 2-7/8" Diam Post