2-7/8" Heavy Duty Mainstay with SwivelNon-removable pedestal system in 2-7/8" offers a heavy-duty base and post for today&';s larger and faster recreational boats. The base is permanent mold AC7A aluminum alloy with an anodized finish for maximum strength and corrosion protection. Then a 2-7/8" heavy-duty extruded post is pressed and hydra-formed into the base mechanically forming them together. This proprietary process allows maximum strength for a sturdy pedestal.Features: 2-7/8 in. pedestal with 9" round base Rigid 4-keyed aluminum post, anodized finish Air-powered height adjustment Adjusts (inches) 14" to 19.5" Warranty: 5 years WARNING: This product can expose you to chemicals which are known to the State of California to cause cancer, birth defects or other reproductive harm. For more information go to P65Warnings.ca.gov. .embed-container { position: relative; padding-bottom: 56.25%; height: 0; overflow: hidden; max-width: 100%; } .embed-container iframe, .embed-container object, .embed-container embed { position: absolute; top: 0; left: 0; width: 100%; height: 100%; }