SEAFLO 6” Marine Inspection Hatch Screw Out Deck Plate Product Description: These weather-tight, O-ring sealed deck plates are ideal for interior and exterior applications. They have a great design and are built for strength and durability. Strong ABS Moulded Design, Anti-Aging, Anti-Corrosive, Ultraviolet Resistant Product Features: Strong ABS Moulded Design, Anti-Aging, Anti-Corrosive, Ultraviolet Resistant Durable Water-Tight O-Ring Low profile design Reinforced design with a non-slip surface Easy to install, Pre-drilled countersunk holes (screws not included) Dimensions (Inches): Inside Diameter: 6" Cutout Diameter: 6.3" Outside Diameter: 7.8" Dimensions (Millimeter): Inside Diameter: 151mm Cutout Diameter: 161mm Outside Diameter: 198mm