Bomar 900 Series molded marine hatches are a great addition to your boat & make great replacements for older, leaky hatches Quick action dogs - handle latches Vent positioning Smoke acrylic lens Collet arm Color: Black Hatch Opening: 17 1/2" x 12 1/2" Hole Cut Out: 17 7/8" x 12 7/8" Outer Diameter of Deck Flange: 19 7/8" x 14 7/8" Outer Diameter of Lid: 20 3/8" x 15 1/8" Black