Square ship window made from brass with cross pieces, size 55 x 55 cm, suitable for installation as skylight. The window can be locked into place when opened and tightly shut with the lever seals on the inside. The rubber gasket seals the window completely windproof. It is equipped with cross pieces that allow people to stand on the installed window. Dimensions: A: Overall dimension 550 x 550 mm B: Insert dimension 498 x 498 mm C: Opening dimension 490 x 490 mm D: Glass dimension 455 x 455 mm