Anodised aluminium base and pole with glass-reinforced nylon locking swivel top for saltwater application. Sturdy 73mm x 3mm internal rib reinforced post. The swivel top is heavily reinforced and being nylon offers silent swivelling. Mount base accepts countersunk screws or hex head. Directly accepts 183080 seat slide. Available in four heights but pedestals can be easily cut down if a lower seating height is required.