Features: 1.Convenient keyless design, just lift built?in tab on cap and turn to open or close. 2.Complete with stainless steel retaining chain, to avoid losing or misplacing of cap. 3.Strong corrosion resistance, durable in saltwater circumstance, does not rust. 4.316 stainless steel hardware with wide application, suitable for boats, yachts, caravan. 5.Lost wax process and cover surface polished for mirror reflection, strong and sturdy. Small and light in weight, easy to install. Specification: Conditon: Brand New Item Type: Deck Filler Material: AISI 316 Stainless Steel Color: As Pictures Shown Optional Size: Approx. O.D. 38mm/ 1?1/2in, O.D. 50mm/2in O.D: Approx. 1?1/2in (38mm) Height: Approx. 84mm/3.31in Fastener Diameter: Approx. 6mm/0.2in Screw Off Top Plate. Approx. 74mm/2.91inch Dia, with pull out lug ( for screwing off with ease),safety chain. O.D: aPPROX. 2in (50mm) Height: Approx. 81mm/3.19in Fastener Diameter: Approx. 6mm/0.2in Screw Off Top Plate. Approx. 80mm/3.15inch Dia, with pull out lug ( for screwing off with ease),safety chain.