Springfield Marine EZ Ride Boat Seat Pedestal Package Features 3-12 of vertical travel Intended for recreational inshore use Tested to ABYC H31 dynamic static loads 12 aluminum pedestal 9 round base 3-18 outer post 2-78 inner post 4 grooves with keys provide rotation lock Keys restrict movement collar Anodized finish Uses a gas shock inside a mechanical spring Wave dampening Warranty 5 Years SubstrateFrame California Residents WARNING Cancer and Reproductive Harm - P65Warnings.ca.gov Warranty In