KingPin™ 7" x 7" Stainless Steel Square Base (Threaded)KingPin™ 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: 1-3/4"Length: 7"Width: 7"Finish: SatinMaterial: Stainless Steel