Product Details:

• Fixed Height Seat Base
• Made by Garelick 
• Part # B086C4VPFX  
• 18" High
• Provides Secure Mounting of any Seat
• Designed for Boats
• 360° 4-prong Spider Style Swivel at the Top
• Positive Locking
• Polished Aluminum Material
• Smooth Stanchion Tube is 2 7/8" in Diameter
• Base Plate is 9.25" in Diameter
• Model # AMRG-75032