Springfield Marine 1780238 3 Stage Pedestal. The 12" diameter base with 11" hole pattern for added stability. Nylon clamping bushings with stainless steel hardware. Features gas powered height adjustment. Features of Springfield Marine 1660230 1780238 3 Stage Pedestal Adjust 12-3/4"; 20"; 28" 12-1/2" Square table mount 12" Diameter base with 11" hole pattern for added stability Nylon clamping bushings with stainless steel hardware. Package Contents: Springfield Marine 1660230 1780238 3 Stage Pedestal Springfield Marine 1660230: 1780238 3 Stage Pedestal