Five Oceans Marine Plastic Access Hatch Inspection for Boat Outside Measures: 14-3/4" x 10-5/16" - Interior Size: 11-1/2" x 7-1/2" BC-3624 Type: Access Hatch Material: Polypropylene Cutout measures: 11-5/8" x 7-3/4" Outside measures: 14-3/4" x 10-5/16" (375 x 270 mm) Inside measures: 11-1/2" x 7-1/2" (192 x 291 mm)