Bomar Commercial Grade Cast Aluminum Hinged Hatch 15 inch x 24 inch Oval 4-Dog Flush Mount Watertight. Hatch is made of Almag-35 Aluminum with Inside handle and Outside stainless steel t-handle. This hatch is hinged. Hatch Opening: 15 inches x 24 inches (380 x 610 millimeters), Outside Deck Flange: 23-1/2 inches 30-1/2 inches (597 x 775 millimeters), Cutout: 20-1/2 inches x 26-3/4 inches (520 x 568 millimeters), Extends below deck: 5 inches (127 millimeters), Weight: 34 pounds. This hatch opens from the inside and the outside.