Manhattan Weatherproof Outdoor Poster Frames. As an extension to our popular Manhattan Snap Frame Range we now offer Weatherproof Outdoor Poster Frames. These durable and stylish frames are manufactured using a 45mm wide aluminium extrusion and have a polycarbonate front panel that is unbreakable under normal use. The frames open on hinges and have fold-out stays to hold the frame open while the poster is changed. Manhattan Outdoor Poster Frames are key-lockable for security, come with fixing screws and plugs.