Bomar 900 Series Molded Hatch 16-1/4 Square 2-Dog Black. Hatch has quick action dogs, collect arm and vent position. Smoke color acrylic lens. Options Sold Separately: Trim ring (GT 966-1 black, GT 966-2 white) and screen (GS 966-18 black, GS 966-28 white). Hatch Opening: 16-1/4 inches x 16-1/4 inches (414 millimeters), Outside Deck Flange: 18-7/8 inches x 18-7/8 inches (480 millimeters), Outside Lid: 19-1/8 inches x 19-3/8 inches (486 millimeters x 492 millimeters), Cutout: 16-7/8 inches x 16-7/8 inches (428 millimeters), Cutout Radius: 1-11/16 inches (43 millimeters), Weight: 7-1/2 pounds.