This beautiful nautical instrument is made from the finest materials, and is at home in any marine environment. This unit is water resistant with seals on the front and back of the unit and includes a lifetime warranty against corrosion. * The manufacturing process includes double plating: Physical Vapor Deposition (PVD) Zirconium plating over Chromium plating. Zirconium is a metal which has a high hardness and melting point. * It is corrosion resistant, and will never tarnish, discolor or scratch. The surface of Zirconium Coating has the color of brass, with a mirror, hand polished finish. The aluminous dial is suitable for various weather harsh conditions. * High quality stainless steel mounting screws with PVD Zirconium plating are included. All fasteners are made of stainless steel, suitable for salt water environments. * Size: case diameter 6" (150mm), dial diameter 4" (95mm), depth 2-1/2" (61mm). Includes a 5 year warranty on movement. * High quality stainless steel mounting screws with PVD Zirconium plating are included; All fasteners are made of stainless steel, suitable for salt water environments * It is corrosion resistant and will never tarnish, discolor or scratch; The surface of Zirconium Coating has the color of brass, with a mirror, hand polished finish; The aluminous dial is suitable for various weather harsh conditions * Size: case diameter 6" (150mm), dial diameter 4" (95mm), depth 2-1/2" (61mm); Includes a 5 year warranty on movement * The manufacturing process includes double plating: Physical Vapor Deposition (PVD) Zirconium plating over Chromium plating; Zirconium is a metal which has a high hardness and melting point * This beautiful nautical instrument is made from the finest materials and is at home in any marine environment; This unit is water resistant with seals on the front and back of the unit and includes a lifetime warranty against corrosion