The True Blue Box Level offers superior performance in the key areas of functionality and durability. Powerful rare earth magnets provide superior holding strength. Highlights: Length: 24 inch Material: Aluminum Magnetic: Yes Level Type: Box Number of Vials: 3 vial Color: Blue/Black Application: Leveling Accuracy: 0.0005 inch Reinforced vial locking system secures acrylic block vials and delivers long life accuracy Tool-free removable, shock absorbing endcaps provide superior protection and scribing performance Precision milled edges for guaranteed accuracy Surface grippers prevent the level from sliding on flat or angled surfaces High contrast e-BAND vials highlight the edge of the bubble 300 degree viewing window maximizes range of view Hang hole for ease of storage e-Band vials are accurate to within 0.0005" per inch in all working positions