Springfield Spring-Lock Boat Seat Power Pedestals Springfields Spring-Lock power pedestals use a unique design utilizing compressed gas to adjust pedestal height. Fits Spring-Lock base 1640002. Two sizes available for any application. Features 9 Diameter Satin Base 8 hole pattern, high-strength aluminum. Below the deck mount requires a 4 hole in deck. Use with any Spring-Lock or Clip-Lock post, sold separately Warranty 5 Years California Residents WARNING Cancer and Reproductive Harm - P65Warnin