Lewmar Ocean Series Flat Base Hatch This Lewmar Ocean Series Flat Base Hatch features a corrosion-resistant anodized aluminum frame with inset hinges, snag resistant rounded corners and a flat base and it is also composed of rugged construction for ultimate protection against the elements. The friction hinge allows for any open position without the need for support arms while the self-supporting friction levers hold the lid open in any position of up to 95. This ocean hatch will work on vessel d