The Milwaukee REDSTICK™ Compact Box Levels provide industry-leading performance with best-in-class vial readability, frame durability, and magnet strength. 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™ Compact Box Levels are backed by a Lifetime Accuracy Guarantee and a Limited Lifetime Warranty. Length is 24"