The Milwaukee REDSTICK™ box levels provide industry-leading performance with best-in-class vial readability, frame durability, and magnet strength. The REINFORCED 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. The Milwaukee REDSTICK™ box levels are backed by a lifetime accuracy guarantee and a Limited Lifetime Warranty.