New 12" Aluminum Round Deck Hatch.   Features marine grade cast aluminum, anodized finish, neoprene seal, Stainless Steel "T" handle hardware, Textured Non-Skid surface.   Opening Diameter 11-7/8", Cutout Diameter 13-3/4", Deck Flange O.D. 15-1/2", Above Deck Height 1/4", Below Deck Depth 3/4".