The SKIL Self-Leveling 360-Degree Cross-Line Laser projects a bright, continuous, horizontal line around an entire room, up to 65 ft. in diameter, making it easy to hang pictures at the same precise height, install chair rail molding or a wallpaper accent, and more. In addition to the 360⁰ continuous level line, it can project plumb cross lines to accurately guide a range of DIY projects.