10", Magnetic, Professional Torpedo Level, Powerful Grip Tight V-Groove Rare Earth Magnets Hold To Flat Or Round Ferrous Metal Surfaces, Oversized Solid Aluminum Frame Jog Site Tough, Surround View Vials Reflect Ambient Light For Easy Read, V-Groove Frame Fits On Pipe & Conduit, Oversized 1/2" Diameter Vials Are Easy Read, Top Read Windows For Easy Viewing, 3 Vials Read Plumb, Level & 45 Degree.