Freeman oval opening portlights are made of Almag 35 cast aluminum framing with 4 drop bolts, 3/8" or ½" polycarbonate glazing and have a hold open eye. Perfect for a vessel's stateroom, fo'c'sle, galley, head, or below deck ventilation/light. FREEMAN Premium Oval Portlights enhance the crisp lines of any boat. A comprehensive range of sizes and optional features are available to customize for most requirements