The Milwaukee® REDSTICK™ Box Levels provide industry-leading performance with best-in-class vial readability, frame durability, and magnet strength. The ALL-METAL BACKBONE™ provides the strongest, most durable frame ensuring long-life accuracy. SHARPSITE™ Vial Technology provides best-in-class readability with a magnified bubble and high-visibility vial spirit. Amplified Rare Earth Magnets maximize holding power.