What impresses me is the strength of the design/build of these hatches.(This could be boring if you're not into building). The heavy bronze hinges encapsulate the upper lens. Plus each upper leaf is through bolted to the teak hatch frame(which is perfectly joined on each corner).

The mating hinge leaves on the curb are also through bolted(2X's). Amazingly, each bolt was redrawn this time, as well as 15 years ago, and re-inserted, without disturbing the wooden plugs(the nuts stayed in place)!

Plus, to override the weakness of wood-fracture along the grain-the curb is through bolted vertically on each side of the curb hinge leaves. This vertical curb through bolting also protects the clasps from splitting the wood. Such thought given to the stresses and material used. Add a centuries old coating preservative maintenance system, and you have hatches with a nearly unlimited life span.

They're not perfect! If you take solid water over the deck, without gasketing and extra dogs, they would inevitably leak a bit. But that's not our coastal usage, they're dry without gasketing. These are fast and easy and easy to use overhead hatches and allow many ventilation variations, which is what I appreciate. Functional, attractive, robustly built.