Springfield 1780238 Wave Dampening Pedestal

4 Grooves with 4 keys provide rotation lock and restrict movement 9" round floor base 2-7/8" Wave Dampening Designed for quick and simple installationYou may also like Springfield 1100019 Locking 12-Way Seat Swivel - 6.75" Square with 0° Tilt, Stainless Steel.