Bomar Commercial Grade Cast Aluminum Hatch Oval. A 4-Dog Flush Mount watertight hatch that is made of Almag-35 Aluminum and has an outside opening stainless steel t-handle and opens from the inside. This hatch is not hinged

Hatch Opening: 12 3/16" x 18 1/4" (310mm x 464mm)
Outside Deck Flange: 18 11/16" x 24 3/4" (475mm x 629mm)
Cutout: 14 15/16"x 21" (380mm x 534mm)
Extends below deck: 5 3/8" (143mm)
Weight: 27 pounds.