KingPin(TM) 7 x 7 Stainless Steel Square Base (Threaded)KingPin(TM) 7 L x 7 W Satin Stainless Steel Threaded Square Base with Nylon Bushing for 1-3/4 D Post (1630001) by Springfield Marine. Springfield Marine knows that comfort is important in marine seating. Whether behind the wheel for long passages in rough water; dropping a line in a quiet creek; or anywhere in between, Springfield Marine offers a wide range of configurations and options.Features:7 x 7 stainless steel base, with nylon bushing and satin finish4 cup depth below the deckMount requires a 2-1/2 hole in the deckBuilt to provide secure, hassle-free boat seat mountingSpecifications:Post Diameter: 1-3/4Length: 7Width: 7Finish: SatinMaterial: Stainless Steel