The Klein Tools 9-Inch Lighted Aluminum Billet level is designed for effective leveling on and off the construction site. The patented Magnet Track keeps the powerful Rare-Earth magnets secure and ensures that they won't fall out. This leveler also includes large, easy-to-read vials and vial windows for easy viewing at any angle. The vials are also brightly illuminated by the LED lights to ensure easy reading in all light conditions. The V-groove fits snugly into pillars, posts, conduit, pipe, and any other round surface. The tapered nose slides into pockets and corners. Whether you're a carpenter, electrician, plumber, drywall installer, DIY enthusiast, or professional tradesperson, the Klein Tools Cat. No. 935RB can help make your leveling tasks easier.