Bomar Commercial Grade Cast Aluminum Hatch 15 inch x 24 inch Oval 4-Dog Flush Mount Watertight. Hatch is ade of Almag-35 Aluminum and has outside opening stainless steel t-handle. This hatch is not hinged. Hatch Opening: 15 inches x 24 inches (380 x 610 millimeters), Outside Deck Flange: 21-3/4 inches x 30-1/2 inches (552 x 775 millimeters), Cutout: 17-3/4 inches x 26-3/4 inches (450 x 680 millimeters), Extends below deck: 5 inches (185 millimeters), Weight: 34 pounds. This model does not open from the inside. An optional inside handle is available.