1Made of marine grade 304 stainless steel, hard and durable, has solid structure, also has long service life. 2Has wide applicability, an be applied for related ventilation of ships, oceans, yachts, RVs, houses, etc. 3Side knob push?pull rotary design, is easy for you to operate, saving time and energy. 4The surface is polished, is corrosion?resistant, durable, more in line with your needs. 55in inner diameter, small, light in weight, easy to install, can bring you more convenience.1 xBoatVentCoverCondition: 100% New_x000D_Item Type: Boat Vent CoverMaterial: 304 Stainless Steel_x000D_Color: Silver_x000D_Diameter: Approx. 128mm/5in 1Made of marine grade 304 stainless steel, hard and durable, has solid structure, also has long service life. 2Has wide applicability, an be applied for related ventilation of ships, oceans, yachts, RVs, houses, etc. 3Side knob push?pull rotary design, is easy for you to operate, saving time and energy. 4The surface is polished, is corrosion?resistant, durable, more in line with your needs. 55in inner diameter, small, light in weight, easy to install, can bring you more convenience.1 xBoatVentCover