You will need to use silicone waterproof sealants on each of the eight screw holes to prevent water from seeping through the holes. Flange has beveled edge, pry-out notch and 8 countersunk fastener holes. Flange is predrilled for #8 screws.
Impact and Corrosion Resistant. Manufactured of high quality ABS material for long life. Convenient to install, pull it out easily. Special design for locking features
These Hatch Covers help to reduce UV damage to your hatch as well as minimize the light entering your boat.
Opening Diameter: 6" Overall Diameter: 8" Distance between two opposite screw holes 7 1/4''