It requires a special recess to be installed into the deck to receive the hatch. Clean and simple look, no protruding parts, space-wise use of deck surface.Technical data:- No visible frame: the black acrylic panel is all that can be seen on deck.- Very thick self-supporting plexiglass lid.- 90° opening stay, self-locking in any position.- Smoked lens available upon request.- Exterior handle for use as escape hatch.- CE-approved for 2A area.Compatible with LEWMAR flyscreens, trimming rings and frames.