Description: 100% brand new. CNC machined,made of marine grade stainless steel 316. Corrosion resistance and durable in the saltwater environment. These weather-tight, O-ring sealed deck plates are ideal for interior and exterior applications. Bright polished finish and give your boat a new look. Easy installation.Pre-drilled countersunk holes (screws not included). Specification: Material: 304 Stainless Steel Inside Diameter: 107 mm / 4.21 inch Outside Diameter: 139 mm / 5.47 inch Package Includes: 1 Piece Boat Deck Plate Note: The item may be slightly different due to manual measurement. Thanks for your understanding!