Double sides screw frame ultra light box is a kind of light box which can show different pictures at both sides, the thickness is only 42mm. High quality material including aluminum frame with special designed construction make safe and stylish outlook of this kind of light box. Distributed light from the edges to make sure there are no hot or cold spots or shadows. Steel wire rope is for your easy installation. This light box is widely used for the indoor advertising in the trade show, lobbies, metro stations, etc…